Numbers 8:23-25

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;