Numbers 31:16
“Behold, these caused the children of Israel, through the counsel of Balaam, to commit trespass against the Lord in the matter of Peor, and there was a plague among the congregation of the Lord.”
And Moses was wroth with the officers of the host, with the captains over thousands, and captains over hundreds, which came from the battle.
And Moses said unto them, Have ye saved all the women alive?
Behold, these caused the children of Israel, through the counsel of Balaam, to commit trespass against the Lord in the matter of Peor, and there was a plague among the congregation of the Lord.
Now therefore kill every male among the little ones, and kill every woman that hath known man by lying with him.
But all the women children, that have not known a man by lying with him, keep alive for yourselves.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“But I have a few things against thee, because thou hast there them that hold the doctrine of Balaam, who taught Balac to cast a stumblingblock before the children of Israel, to eat things sacrificed unto idols, and to commit fornication.”
“Which have forsaken the right way, and are gone astray, following the way of Balaam the son of Bosor, who loved the wages of unrighteousness;”
“And Israel abode in Shittim, and the people began to commit whoredom with the daughters of Moab.”
“But I have a few things against thee, because thou hast there them that hold the doctrine of Balaam, who taught Balac to cast a stumblingblock before the children of Israel, to eat things sacrificed unto idols, and to commit fornication.”
“Which have forsaken the right way, and are gone astray, following the way of Balaam the son of Bosor, who loved the wages of unrighteousness;”