Stewardship is taking care of the things God has given us, and managing them well. Here Abraham gives money, a tythe back to God. OK, question time, but first read the entire chapter of Genesis 14.
What happened here? Abram is in conversation with a local priest of God named Melchisidek. The first phrase is the tale end of the words being spoken by this high priest. “blessed be God Most High, who has delivered your enemies into your hand.” The short answer is that we give back to God not only for what he has given but also for the protection he offers to us.