Numbers 8:22-26

ECB(i) 22 And afterward the Leviym go in to serve their service in the tent of the congregation at the face of Aharon and at the face of his sons: as Yah Veh misvahed Mosheh concerning the Leviym, thus they work to them. 23 And Yah Veh words to Mosheh, saying, 24 This is for the Leviym from a son of twenty-five years and upward: they go in to host the hosting of the tent of the congregation: 25 and a son of fifty years they turn away from hosting the service to serve no more: 26 but minister with their brothers in the tent of the congregation to guard the guard, but serve no service. Work thus to the Leviym regarding their guard.