Genesis 14:22-23

But Abram said to the king of Sodom, “I raised my hand to YAHWEH, God Most High, and I pledged a solemn oath to the Possessor of heaven and earth that I would keep nothing for myself that belongs to you, not even a thread of a garment or sandal strap. That way, you will never be able to say, ‘I was the one that made Abram rich.’