Numbers 8:23-26

23And Jehovah spokeH1696 to MosesH4872, sayingH559, 24This is that which concerneth the LevitesH3881: from twenty-five yearsH8141 old and upwardH4605 shall he comeH935 to labour in the workH5656 of the serviceH5656 of the tentH168 of meetingH4150. 25And from fiftyH2572 yearsH8141 old he shall retire from the labour of the serviceH5656, and shall serveH5647 no more; 26but he shall minister with his brethren in the tentH168 of meetingH4150, and keepH8104 the chargeH4931, but he shall not serveH5647 [in] the serviceH5656. ThusH3602 shalt thou do unto the LevitesH3881 with regard to their charges.