Genesis 15:4-6

Young's Literal Translation

⁴ And lo, the word of Jehovah [is] unto him, saying, `This [one] doth not heir thee; but he who cometh out from thy bowels, he doth heir thee;'

⁵ and He bringeth him out without, and saith, `Look attentively, I pray thee, towards the heavens, and count the stars, if thou art able to count them;' and He saith to him, `Thus is thy seed.'

⁶ And he hath believed in Jehovah, and He reckoneth it to him -- righteousness.