Genesis 19:33-35

Young's Literal Translation

³³ And they cause their father to drink wine on that night; and the first-born goeth in, and lieth with her father, and he hath not known in her lying down, or in her rising up.

³⁴ And it cometh to pass, on the morrow, that the first-born saith unto the younger, `Lo, I have lain yesterday-night with my father: we cause him to drink wine also to-night, and go thou in, lie with him, and we preserve from our father -- a seed.'

³⁵ And they cause their father to drink wine on that night also, and the younger riseth and lieth with him, and he hath not known in her lying down, or in her rising up.