Genesis 15:3-5

Young's Literal Translation

³ And Abram saith, `Lo, to me Thou hast not given seed, and lo, a domestic doth heir me.'

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.'