Parallel
Numbers 8:26
Brenton's English Septuagint · Berean Standard Bible
And his brother shall serve in the tabernacle of witness to keep charges, but he shall not do works: so shalt thou do to the Levites in their charges.
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.”