LITV(i)
24 This is that which pertains to the Levites: from twenty five years old and upward he shall go in to do the service and the works of the tabernacle of the congregation.
25 And from a son of fifty years they shall return from the service of the work, and shall not serve any more.
26 But he shall serve with his brothers in the tabernacle of the congregation, to keep the charge; only he shall not serve at a service. So you shall do to the Levites concerning their charge.