Genesis 19:31-33

Young's Literal Translation

³¹ And the first-born saith unto the younger, `Our father [is] old, and a man there is not in the earth to come in unto us, as [is] the way of all the earth;

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.