Genesis 14: 18 -21
And Melchizedek king of Salem brought bread and wine; now he was a priest of God Most High. And he blessed him and said, “Blessed be Abram of God Most High, possessor of heaven and earth; and blessed be God Most High, who has delivered your enemies into your hand.” And he gave him a tenth of all.
It is a little difficult to tell what is going on here without reading the entire story so let me expound just a little. Abraham, before his name was changed from Abram to Abraham, had gone out to battle against some kings. These kings had, as part of their spoils from previous battle, taken Lot and his family captive. So, Abram (Abraham) went out against them in order to rescue Lot, his nephew. Abram won and reclaimed all the goods and people that had been taken. Melchizedek, who was a high priest, ministered to Abram after the battle and blessed Abram and Abram gave to Melchizedek a tenth of all the spoil or tenth of all of the income of the battle. This is the model of the tithe. As you read on in the story, you find out that various distributions were made after the battle. In fact, Abram ended up keeping nothing. It is interesting to note, though, that the ten percent was paid over to Melchizedek before any other distributions were made. That is the tithe and it provides that there will always be food in the house of God to meet every need.