Genesis 15:4-6

And immediately the word of the Lord came to him, saying : He shall not be thy heir: but he that shall come out of thy bowels, him shalt thou have for thy heir.

And he brought him forth abroad, and said to him: Look up to heaven and number the stars if thou canst. And he said to him: So shall thy seed be.

Abram believed God, and it was reputed to him unto justice.