Genesis 15:2-5

2But Abram said, “Sovereign Lord, what can you give me since I remain childless and the one who will inherit my estate is Eliezer of Damascus?”

3And Abram said, “You have given me no children; so a servant in my household will be my heir.”

4Then the word of the Lord came to him: “This man will not be your heir, but a son who is your own flesh and blood will be your heir.”

5He took him outside and said, “Look up at the sky and count the stars—if indeed you can count them.” Then he said to him, “So shall your offspring be.”