Genesis 15:4-8

4Then behold, the word of the Lord came to him, saying, “This man [Eliezer] will not be your heir but he who shall come from your own body shall be your heir.”

5And the Lord brought Abram outside [his tent into the night] and said, “Look now toward the heavens and count the stars—if you are able to count them.” Then He said to him, “So [numerous] shall your descendants be.”

6Then Abram believed in (affirmed, trusted in, relied on, remained steadfast to) the Lord; and He counted (credited) it to him as righteousness (doing right in regard to God and man).

7And He said to him, “I am the [same] Lord who brought you out of Ur of the Chaldeans, to give you this land as an inheritance.”

8But Abram said, “Lord God, by what [proof] will I know that I will inherit it?”