After that, they may assist their brothers in fulfilling their duties at the Tent of Meeting, but they themselves are not to do the work. This is how you are to assign responsibilities to the Levites.”
Jewish Publication Society of America Version (JPS1917) - Numbers 8:26 >but shall minister with their brethren in the tent of meeting, to keep the charge, but they shall do no manner of service. Thus shalt thou do unto the Levites touching their charges.'