Genesis 19:32-34

Young's Literal Translation

³² come, we cause our father to drink wine, and lie with him, and preserve from our father -- a seed.'

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.'