They are to take care of all the furnishings of the tent of meeting, fulfilling the obligations of the Israelites by doing the work of the tabernacle. (NIV)
And they shall keep all the instruments and furnishings of the Tent of Meeting and take charge of [attending] the Israelites, to serve in the tabernacle. (AMP)
And they shall keep all the instruments of the tabernacle of the congregation, and the charge of the children of Israel, to do the service of the tabernacle. (KJV)