Genesis 19:37

32 Come, let us give our father much wine, and we will go into his bed, so that we may have offspring by our father,

33 And that night they made their father take much wine; and the older daughter went into his bed; and he had no knowledge of when she went in or when she went away.

34 And on the day after, the older daughter said to the younger, Last night I was with my father; let us make him take much wine this night again, and do you go to him, so that we may have offspring by our father.

35 And that night again they made their father take much wine; and the younger daughter went into his bed; and he had no knowledge of when she went in or when she went away.

36 And so the two daughters of Lot were with child by their father.

37 And the older daughter had a son, and she gave him the name Moab: he is the father of the Moabites to this day.

38 And the younger had a son and gave him the name Ben-ammi: from him come the children of Ammon to this day.