וַאֲנִ֗י הִנֵּ֤ה לָקַ֙חְתִּי֙ אֶת־אֲחֵיכֶ֣ם הַלְוִיִּ֔ם מִתּ֖וֹךְ בְּנֵ֣י יִשְׂרָאֵ֑ל לָכֶ֞ם מַתָּנָ֤ה נְתֻנִים֙ לַֽיהוָ֔ה לַעֲבֹ֕ד אֶת־עֲבֹדַ֖ת אֹ֥הֶל מוֹעֵֽד׃
E io, ecco, ho preso i tuoi fratelli Leviti tra i figli d'Israele; per te sono dati in dono all'Eterno, per fare il servizio della tenda di adunanza.
Rashi on Numbers
לכם מתנה נתתים TO YOU THEY ARE GIVEN AS A GIFT — I might think that they are given unto you for your private work! It, however, states, “[to you they are given as a gift] for the Lord” — meaning, as explained above (v. 2), — to keep the charge of Temple treasuries and superintendents (Sifrei Bamidbar 116:2).
Sforno on Numbers
'לכם מתנה נתוני לה, they are bidden on your behalf to carry out all these duties in connection with the Tabernacle.
Siftei Chakhamim
Perhaps .. .to attend. Therefore, the mandate to be custodians was to your benefit, because if it were not for the Levites doing this you would be charged with performing these roles.