Genesis 15:2-4

Amplified Bible

² Abram said, “Lord ^[a]God, what reward will You give me, since I am [leaving this world] childless, and he who will be the owner and heir of my house is this [servant] Eliezer from Damascus?” ³ And Abram continued, “Since You have given no child to me, one (a servant) born in my house is my heir.” ⁴ Then behold, the word of the Lord came to him, saying, “This man [Eliezer] will not be your heir but he who shall come from your own body shall be your heir.”