וַיְצַ֤ו לָהֶם֙ מֹשֶׁ֔ה אֵ֚ת אֶלְעָזָ֣ר הַכֹּהֵ֔ן וְאֵ֖ת יְהוֹשֻׁ֣עַ בִּן־נ֑וּן וְאֶת־רָאשֵׁ֛י אֲב֥וֹת הַמַּטּ֖וֹת לִבְנֵ֥י יִשְׂרָאֵֽל׃
Moïse enjoignit, à leur sujet, au pontife Eléazar, à Josué, fils de Noun, et aux principaux membres des tribus des enfants d’Israël,
Ibn Ezra
The heads of the tribes: According to my opinion that this section is after the war with Midian, it is for this reason that [the section about that war] is after it; just as "And Miriam and Aaron spoke about Moses (Numbers 12:1) is after "and they were in Chatserot" (Numbers 11:35) [even though it happened earlier], as I explained.1 And Scripture states that the Children of Gad came to Moses and Elazar and the princes of the congregation and they spoke their words. And afterwards, it is written (Numbers 32:28), "Then Moses gave instructions concerning them to Elazar the priest, Joshua son of Nun, and the family heads of the Israelite tribes" - which are the princes of the congregation [just] mentioned. And since Moses said to the Children of Gad and the Children of Reuben (Numbers 32:24), "you shall do what comes out of your mouth"; it is therefore written (Numbers 30:2), "And Moses spoke to the heads of the tribes," and then (verse 3), "he shall do like everything that comes out of his mouth."