Numbers 8:24-26

New Catholic Bible

²⁴ “The Levites will go in to perform the work of the tent of meeting from the age of twenty-five years old. ²⁵ Then, when they are fifty years old, they will stop performing that service. They will work no more. ²⁶ They may assist their brothers in carrying out the duties of the tent of meeting, but they themselves are not to perform that work. This is how you will establish the responsibilities of the Levites.”