Genesis 15:1-4

After these things happened, the LORD spoke his word to Abram in a vision: “Abram, don’t be afraid. I will defend you, and I will give you a great reward.” But Abram said, “Lord GOD, what can you give me? I have no son, so my slave Eliezer from Damascus will get everything I own after I die.” Abram said, “Look, you have given me no son, so a slave born in my house will inherit everything I have.” Then the LORD spoke his word to Abram: “He will not be the one to inherit what you have. You will have a son of your own who will inherit what you have.”