After these events, the LORD's word came to Abram in a vision, "Don't be afraid, Abram. I am your protector. Your reward will be very great."
References for Genesis 15:1
But Abram said, "LORD God, what can you possibly give me, since I still have no children? The head of my household is Eliezer, a man from Damascus."
References for Genesis 15:2
He continued, "Since you haven't given me any children, the head of my household will be my heir."
The LORD's word came immediately to him, "This man will not be your heir. Your heir will definitely be your very own biological child."
Then he brought Abram outside and said, "Look up at the sky and count the stars if you think you can count them. He continued, "This is how many children you will have."
Abram trusted the LORD, and the LORD recognized Abram's high moral character.