Genesis 15:4-6

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.” Then God led Abram outside and said, “Look at the sky. There are so many stars you cannot count them. Your descendants also will be too many to count.” Abram believed the LORD. And the LORD accepted Abram’s faith, and that faith made him right with God.