DID GOD TELL ABRAHAM TO TITHE?
Read the story in Genesis 14.
16 And he brought back all the goods, and also brought again his brother Lot, and his goods, and the women also, and the people.
17 And the king of Sodom went out to meet him after his return from the slaughter of Chedorlaomer, and of the kings that were with him, at the valley of Shaveh, which is the king’s dale.
18 And Melchizedek king of Salem brought forth bread and wine: and he was the priest of the most high God.
19 And he blessed him, and said, Blessed be Abram of the most high God, possessor of heaven and earth:
20 And blessed be the most high God, which hath delivered thine enemies into thy hand. And he gave him tithes of all.
Hebrews 7:4 (KJV) Now consider how great this man was, unto whom even the patriarch Abraham gave the tenth of the spoils.
We know by the story in Genesis 14, and confirmed by Hebrews 7:4, that "tithes of all" means a tenth of the war spoils, not a tenth of Abram's income or wealth.
The scriptures do not tell us why Abram gave the tenth. We should not try and guess. We just don't know.
We do know this. Under the Mosaic law, God did not want a tenth of the spoils as evidenced in Numbers 31.