Numbers 8:22-26 After that, the Levites came to perform their service at the Tent of Meeting in the presence of Aaron and his sons. Thus they did with the Levites just as the LORD had commanded Moses.

BSB⁽ⁱ⁾ ²² After that, the Levites came to perform their service at the Tent of Meeting in the presence of Aaron and his sons. Thus they did with the Levites just as the LORD had commanded Moses. ²³ And the LORD said to Moses, ²⁴ “This applies to the Levites: Men twenty-five years of age or older shall enter to perform the service in the work at the Tent of Meeting. ²⁵ But at the age of fifty, they must retire from performing the work and no longer serve. ²⁶ 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.”