קַ֚ח אֶֽת־אַהֲרֹ֔ן וְאֶת־אֶלְעָזָ֖ר בְּנ֑וֹ וְהַ֥עַל אֹתָ֖ם הֹ֥ר הָהָֽר׃
Nimm Aaron und seinen Sohn Elasar und führe sie hinauf den Berg Hor.
Rashi on Numbers
קח את אהרן TAKE AARON by consoling words — say to him: Happy art thou that thou wilt see thy crown being given to thy son, something to which I am not privileged (Midrash Tanchuma, Chukat 17).
Rabbeinu Bahya
קח את אהרן, “take Aaron, etc.” The Torah employs the same term it had employed when Aaron was appointed as High Priest where G’d had also said to Moses: “take Aaron” (Leviticus 8,2).