Abram had pursued the enemy who had attacked Sodom and taken his brother Lot, the people of Sodom, and their goods.  He conquered the enemy and brought back all the people and the spoils that had been taken.  In response to God's blessing delivered by Melchizedek, Abram acknowledged God as the possessor of heaven and earth by giving a tenth (tithe) of all the goods.  The king of Sodom offered all of the goods to Abram, but he refused.  Abram put God first by giving a tithe to acknowledge God and returned the rest to the king of Sodom.  He refused to even take a thread of the goods.  For Abram, God was the source of all supply and he was not about to let some man claim to be the one who provided for him.  When Abram made this declaration and put God first as possessor of heaven and earth, God responded by telling Abram that He [God] was Abram's protection (shield) and supplier (exceeding great reward).  When we put God first and acknowledge Him as the one who "owns it all", God promises to supply our every need.

Deuteronomy 10:12-14
     And now, Israel, what doth the Lord thy God require of thee, but to fear the Lord thy God, to walk in all his ways, and to love him, and to serve the Lord thy God with all thy heart and with all thy soul,
     To keep the commandments of the Lord, and his statutes, which I command thee this day for thy good?
     Behold, the heaven and the heaven of heavens is the Lord's thy God, the earth also, with all that therein is.

What does God require?  That we love Him.  Put Him first.  Walk with Him.  Keep His word.  When we do, all that we could ever desire is supplied because He is the possessor of heaven and earth.  He is the source of all supply.

Psalm 50:7-15
     Hear, O my people, and I will speak; O Israel, and I will testify against thee:  I am God, even thy God.
     I will not reprove thee for thy sacrifices or thy burnt offerings, to have been continually before me.
     I will take no bullock out of thy house, nor he goats out of thy folds.
     For every beast of the forest is mine, and the cattle upon a thousand hills.
     I know all the fowls of the mountains: and the wild beasts of the field are mine.
     If I were hungry, I would not tell thee: for the world is mine, and the fulness thereof.
     Will I eat the flesh of bulls, or drink the blood of goats?
     Offer unto God thanksgiving; and pay thy vows unto the most High:
     And call upon me in the day of trouble:  I will deliver thee, and thou shalt glorify me.

God deserves to be glorified.  He is God!  He is our God!  He does not want religious actions.  He wants to be loved.  The sacrifice of bulls & goats for God was not what God wanted.  God does not need these things.  God owns it all!  "Every beast of the forest is mine and the cattle upon a thousand hills."  God wants our love.  Our thanks.  He wants us to call upon Him when we have a need.  When we put Him first and love Him, He will supply all of our need because He is the possessor of heaven and earth.

Psalm 37:4
     Delight thyself also in the Lord; and he shall give thee the desires of thine heart.

Delight thyself also in the Lord!  Put Him first.  Look to Him.  Love Him.  When you do, all your heart's desire is available from God.  He is the possessor of heaven and earth and He will supply our every desire.

Luke 10:1-4
     After these things the Lord appointed other seventy also, and sent them two and two before his face into every city and place, whither he himself would come.
     Therefore said he unto them, The harvest truly is great, but the labourers are few: pray ye therefore the Lord of the harvest, that he would send forth labourers into his harvest.
     Go your ways: behold I send you forth as lambs among wolves.
     Carry neither purse, nor scrip, nor shoes: and salute no man by the way.

Jesus Christ sent these 70 believers out to speak God's word.  He told them to rely upon God as they put Him first and held forth His word.  They were not to carry a purse.  God would supply the funds.  They were not to carry a scrip.  A scrip was a leather pouch for food carried by travelers.  Some scholars believe the scrip refers to a bed roll for sleeping.  Either way, God would supply their food and God would supply the place to sleep.  They were to rely upon God.  They were not to take extra shoes.  God would supply the clothing.  They were not to salute any man along the way.  By salute, Jesus Christ meant solicit.  He was not telling them not to greet others.  They were being sent to speak the word!  He told them not to solicit or beg.  God was going to be their source of supply.  Their needs would be met as they went forth totally relying upon God.

This record reminds me of a story from a book called "God's Smuggler."  In this book, a believer named Andrew was attending a school in Scotland called "Worldwide Evangelization Crusade" (WEC) where believers were taught to trust and rely upon God.  Following is a section from that book:
 

     The weeks passed so fast that soon it came time for me to head out on the first of several training trips in evangelism.  "You're going to like this, Andy," said Mr. Dinnen.  "It's an exercise in trust.  The rules are simple.  Each student on your team is given a one-pound banknote.  With that you go on a missionary tour through Scotland.  You're expected to pay your own transportation, your own lodging, your food, any advertising you want to do, the renting of halls, providing refreshments ----"
     "All on a one-pound note?"
     "Worse than that.  When you get back to school after four weeks, you're expected to pay back the pound!"
     I laughed. "Sounds like we'll be passing the hat all the time."
     "Oh, you're not allowed to take up collections! Never.  You're not to mention money at your meetings.  All of your needs have got to be provided without any manipulation on your part--or the experiment is a failure."
     I was a member of a team of five boys.  Later when I tried to reconstruct where our funds came from during those four weeks, it was hard to.  It seemed that what we needed was always just there.  Sometimes a letter would arrive from one of the boys' parents with a little money.  Sometimes we would get a check in the mail from a church we had visited days or weeks earlier.  The notes that came with these gifts were always interesting.  "I know you don't need money or you would have mentioned it," someone would write.  "But God just wouldn't let me get to sleep tonight until I had put this in an envelope for you."
     Contributions frequently came in the form of produce.  In one little town in the highlands of Scotland we were given six hundred eggs.  We had eggs for breakfast, eggs for lunch, eggs as hor d'oeuvres before a dinner of eggs with an egg-white meringue dessert.  It was weeks before we could look a chicken in the eye.
     But money or produce, we stuck fast to two rules: we never mentioned a need aloud, and we gave away a tithe of whatever came to us as soon as we got it -- within twenty-four hours if possible.
     Another team that set out from school at the same time we did, was not so strict about tithing.  They set aside their ten percent all right, but they didn't give it away immediately, "in case we run into an emergency."  Of course they had emergencies!  So did we, every day.  But they ended their month owing money to hotels, lecture halls, and markets all over Scotland, while we came back to school almost ten pounds ahead.  Fast as we could give money away, God was always swifter, and we ended with money to send to the WEC work overseas.
     There were times before the end of the tour, however, when it looked as though the experiment was failing.  One weekend we were holding meetings in Edinburgh.  We had attracted a large group of young people the first day and were casting about for a way to get them to come back the next.  Suddenly, without consulting anyone, one of the team members stood up and made an announcement.
     "Before the meeting tomorrow evening," he said, "we'd like you all to have tea with us here.  Four o'clock.  How many think they can make it?"
     A couple dozen hands went up, and we were committed.  At first, instead of being delighted, the rest of us were horrified.  All of us knew that we had no tea, no cake, no bread and butter, and exactly five cups.  Nor did we have money to buy these things:  our last penny had gone to rent the hall.  This was going to be a real test of God's care.
     And for a while it looked as though He was going to provide everything through the young people themselves.  After the meeting several of them came forward and said they would like to help.  One offered milk; another, half a pound of tea; another sugar.  One girl even offered to bring dishes. Our tea was rapidly taking shape.  But there was one thing still missing---the cake.  Without cake, these Scottish boys and girls wouldn't consider tea tea.
     So that night in our evening prayer time, we put the matter before God.  "Lord, we've got ourselves into a spot.  From somewhere we've got to get a cake.  Will You help us?"
     That night as we rolled up in our blankets on the floor of the hall, we played guessing games:  How was God going to give us that cake?  Among the five of us, we guessed everything imaginable---or so we thought.
     Morning arrived.  We half expected a heavenly messenger to come to our door bearing a cake.  But no one came.  The morning mail arrived.  We ripped open the two letters, hoping for money.  There was none.  A woman from a nearby church came by to see if she could help.  "Cake" was on the tip of all our tongues, but we swallowed the word and shook our heads.
     "Everything," we assured her, "is in God's hands."
     The tea had been announced for four o'clock in the afternoon.  At three the tables were set, but still we had no cake.  Three-thirty came.  We put on water to boil.  Three-forty-five.
     And then the doorbell rang.
     All of us together ran to the big front entrance, and there was the postman.  In his hand was a large box.
     "Hello, lads," said the postman.  "Got something for you that feels like a food package."  He handed the box to one of the boys. "The delivery day is over, actually," he said, "but I hate to leave a perishable package overnight."
     We thanked him profusely, and the minute he closed the door the boy solemnly handed me the box.  "It's for you, Andrew.  From Mrs. William Hopkins in London."
     I took the package and carefully unwrapped it.  Off came the twine.  Off came the brown outside paper.  Inside, there was no note---only a large white box.  Deep in my soul I knew that I could afford the drama of lifting the lid slowly.  As I did, there, in perfect condition, to be admired by five sets of wondering eyes, was an enormous, glistening, moist, chocolate cake.

Quoted from: "God's Smuggler" by Brother Andrew with John and Elizabeth Sherrill; Guideposts Associates, Inc. Carmel, New York - 1967