Genesis 19:30-32

Young's Literal Translation

³⁰ And Lot goeth up out of Zoar, and dwelleth in the mountain, and his two daughters with him, for he hath been afraid of dwelling in Zoar, and he dwelleth in a cave, he and his two daughters.

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.'