וַיִּפְקֹ֨ד מֹשֶׁ֧ה וְאַהֲרֹ֛ן וּנְשִׂיאֵ֥י הָעֵדָ֖ה אֶת־בְּנֵ֣י הַקְּהָתִ֑י לְמִשְׁפְּחֹתָ֖ם וּלְבֵ֥ית אֲבֹתָֽם׃
Моисей, Аарон и князья собрания собрали сыновей катофитов по родам их и по отцам их.'дома,
Or HaChaim
אל משה, to Moses. Interestingly, when the count is actually being performed (verse 34) the Torah reports that both Moses and Aaron did the counting. This was because already in 4,1 G'd had commanded both Moses and Aaron to do the counting. G'd included Aaron in the commandment to instruct the Kehatites to be very careful so that they would not incur death seeing Aaron himself was liable to death if he entered the Holy of Holies, the site where the Holy Ark was situated in an unauthorised fashion at an unauthorised time. There was no need to include Aaron then in the command to assign the tasks of the clan of Gershon or of Merari.