Genesis 15:1-3

After these things the word of the Lord came to Abram in a vision, saying, “Do not fear, Abram, I am a shield to you; Your reward shall be very great.”

But Abram said, “Lord God, what will You give me, since I am childless, and the heir of my house is Eliezer of Damascus?”

Abram also said, “Since You have given me no son, one who has been born in my house is my heir.”