Genesis 15:4-8

4Suddenly, the Lord spoke his word to Abram again. He said, “This man will not be your heir. Your own son will be your heir.”

5He took Abram outside and said, “Now look up at the sky and count the stars, if you are able to count them.” He also said to him, “That’s how many descendants you will have!”

6Then Abram believed the Lord, and that faith was regarded as the basis of Abram’s approval by the Lord.

7Then the Lord said to him, “I am the Lord, who brought you out of Ur of the Chaldeans to give you this land so that you will take possession of it.”

8Abram asked, “Almighty Lord, how can I be certain that I will take possession of it?”