Genesis 18:8-10

Young's Literal Translation

⁸ and he taketh butter and milk, and the son of the herd which he hath prepared, and setteth before them; and he is standing by them under the tree, and they do eat.

⁹ And they say unto him, `Where [is] Sarah thy wife?' and he saith, `Lo -- in the tent;'

¹⁰ and he saith, `returning I return unto thee, about the time of life, and lo, to Sarah thy wife a son.'