וְשָׁמְר֣וּ אֶת־מִשְׁמַרְתּ֗וֹ וְאֶת־מִשְׁמֶ֙רֶת֙ כָּל־הָ֣עֵדָ֔ה לִפְנֵ֖י אֹ֣הֶל מוֹעֵ֑ד לַעֲבֹ֖ד אֶת־עֲבֹדַ֥ת הַמִּשְׁכָּֽן׃
At gagampanan nila ang kanyang tungkulin at ang tungkulin ng buong kapisanan sa harap ng Tolda ng Pagtitipon, upang gawin ang paglilingkod sa Tabernakulo.
Rashi
ושמרו את משמרתו AND THEY SHALL KEEP HIS CHARGE — Any post to which a person is appointed and the duties of which he is bound to carry out is everywhere in Scripture and in the Mishnaic idiom called משמרת, an office, a charge. For example, it is stated in the story of Bigthan and Teresh that when they were conspiring against Ahasuerus one said to the other (Megillah 13b): "But surely my official duty (משמרתי) is not the same as your official duty (משמרתך) and therefore we can never meet to put our plans into execution!" Similar, also, is its use in the phrase ,משמרות כהונה ולויה “shifts for duty of priests and Levites”.
Sforno
משמרת כל העדה לפני אהל מועד לעבוד את עבודת המשכן, to assist in the tasks needed to perform the service in the Temple properly. Had it not been for the sin of the golden calf, it would have been the duty/privilege of the members of the Supreme Court, Sanhedrin, to carry out the tasks now allocated to the Levites.
Chizkuni
ושמרו את משמרתו, “and they shall keep his charge (The High Priest’s) in accordance with his instructions.