Gen 14:22-23
22 But Abram told the king of Sodom, "I swear to GOD, The High God, Creator of Heaven and Earth, this solemn oath, 23 that I'll take nothing from you, not so much as a thread or a shoestring.

Abram wouldn’t take a thing from someone so that no one could say: “I made him rich!” and that is to teach us to do the same.