Genesis 15:7-14
 
And behold, the word of the Lord came to him, saying, “This one shall not be your heir, but one who will come from your own body shall be your heir.” Then He brought him outside and said, “Look now toward heaven, and count the stars if you are able to number them.” And He said to him, “So shall your descendants be.” And he believed in the Lord, and He accounted it to him for righteousness. He also said to him, “I am the Lord, who brought you out of Ur of the Chaldeans to give you this land to take possession of it.”

Link: bible-illustrated.blogspot.rs/2015/06/genesis-154-7.html

Thank you, Mark, for making this illustration possible!