Genesis 18:9-11

Young's Literal Translation

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.'

¹¹ And Sarah is hearkening at the opening of the tent, which is behind him;