The first-born said, &c.— There can be no doubt, I suppose, that the principal reason why the sacred writer recorded this event, was to point out to the Israelites the incestuous and hateful origin of the Moabites and Ammonites, their enemies, as before he mentioned the sin of Canaan for the same reason. Other useful and instructive lessons against vice may indeed be derived from this history, which the inspired historian cannot be supposed to approve or commend by barely relating it; and in this view his credit is no way concerned.
Related Commentaries of Genesis 19:31
Genesis 19:31
31 And the firstborn said unto the younger, Our father is old, and there is not a man in the earth to come in unto us after the manner of all the earth: