Numbers 31:2

מאת המדינים [AVENGE THE CHILDREN OF ISRAEL] OF THE MIDIANITES — but not of the Moabites, for the Moabites entered into the matter out of fear, because they feared that they might plunder them, since about them it was stated only, (Deuteronomy 2:9) “Do not contend with them in battle”; but the Midianites, however, had got excited (had interfered) in a quarrel that did not concern them. Another explanation of why God forbade them to wage war against the Moabites, and which explains at the same time why they had been forbidden to wage war against the Ammonites (cf. Deuteronomy 2:19): because, said He, of the two goodly doves (virtuous women) which I am to bring forth from them, — Ruth the Moabitess, and Naamah the Ammonitess [Solomon's wife] (Bava Kamma 38b).

Execute the vengeance of the children of Yisra᾽el on the Midyanim: afterwards thou shalt be gathered to thy people.

נְקֹ֗ם נִקְמַת֙ בְּנֵ֣י יִשְׂרָאֵ֔ל מֵאֵ֖ת הַמִּדְיָנִ֑ים אַחַ֖ר תֵּאָסֵ֥ף אֶל־עַמֶּֽיךָ׃