民数記 25:18

כי צררים הם לכם וגו׳ על דבר פעור FOR THEY SHOWED THEMSELVES YOUR ENEMIES etc. IN THE MATTER OF PEOR — i.e., in that they abandoned their daughters to prostitution in order to lead you astray after Peor; but He did not command them to destroy the Moabites — on account of Ruth who would later on issue from them, just as we state in Bava Kamma 38b.

כִּ֣י צֹרְרִ֥ים הֵם֙ לָכֶ֔ם בְּנִכְלֵיהֶ֛ם אֲשֶׁר־נִכְּל֥וּ לָכֶ֖ם עַל־דְּבַר־פְּע֑וֹר וְעַל־דְּבַ֞ר כׇּזְבִּ֨י בַת־נְשִׂ֤יא מִדְיָן֙ אֲחֹתָ֔ם הַמֻּכָּ֥ה בְיוֹם־הַמַּגֵּפָ֖ה עַל־דְּבַר־פְּעֽוֹר׃

for they vex you with their wiles, with which they have beguiled you in the matter of Pe῾or, and in the matter of Kozbi, the daughter of a prince of Midyan, their sister, who was slain in the day of the plague in the affair of Pe῾or.