וַיֹּ֨אמֶר יְהוָ֜ה אֶל־מֹשֶׁ֗ה אֶסְפָה־לִּ֞י שִׁבְעִ֣ים אִישׁ֮ מִזִּקְנֵ֣י יִשְׂרָאֵל֒ אֲשֶׁ֣ר יָדַ֔עְתָּ כִּי־הֵ֛ם זִקְנֵ֥י הָעָ֖ם וְשֹׁטְרָ֑יו וְלָקַחְתָּ֤ אֹתָם֙ אֶל־אֹ֣הֶל מוֹעֵ֔ד וְהִֽתְיַצְּב֥וּ שָׁ֖ם עִמָּֽךְ׃
Sinabi ng Walang-Hanggan kay Moises: “Tipunin mo para sa Akin ang pitumpung lalaki mula sa mga matanda ng Israel, na kilala mong mga matanda ng bayan at mga tagapamahala nila. Dalhin mo sila sa Tolda ng Pagtatagpo, at doon sila tatayo kasama mo.
Akeidat Yitzchak
G-d’s instruction to Moses to return to the camp, (obliquely referred to by mentioning that his most trusted disciple Joshua had not departed from the tent) teaches us about the reciprocal relationship between Moses and (lehavdil) G-d. It was the former's task to assuage the latter when He was angry; on the other hand G-d would reciprocate when Moses was angry.
Derashot HaRan
In any event we find that the showing of the rod and its mere presence was instrumental in the performance of the miracles by virtue of the Divinity residing upon it. How much more so should it follow that when Moses joined the other prophets in prophesy they would acquire by virtue of his participation with them more than they could acquire on their own power. Therefore, when the Blessed One desired that Aaron and Miriam prophesy suddenly, something that was not in their own power. He included Moses with them. And this is the reason itself for His saying (Numbers 11:16-17): "Gather to me seventy men of the elders of Israel, whom you know to be the elders of the people and its officers, and take them to the tent of meeting, and let them stand there with you. And I will go down, and I will speak with you there, and I will take of the spirit that is upon you and place it upon them." For it is possible that all of those seventy elders were not fit in themselves to receive prophecy if not for Moses' participation with them.