Bede

And the elder said to the younger: Our father is old, and there is no man on earth to come in to us after the manner of all the earth; come, let us make him drink wine, and lie with him, that we may preserve seed from our father. And it was related how the daughters of Lot, by making him drunk with wine, lay with him, and conceived and bore Moab and Ammon, the patriarchs of the Moabites and the Ammonites. …

Commentary on Genesis (Hexaemeron) ↗