Numbers 4:3-5

Complete Jewish Bible

³ all those from thirty to fifty years old; these will enter the corps doing the work in the tent of meeting.

⁴ “Here is how the descendants of K’hat are to serve in the tent of meeting and deal with the especially holy things: ⁵ when the time comes to break camp, Aharon is to go in with his sons, take down the curtain which serves as a screen, and cover the ark of the testimony with it.