Numbers 8:22-26

Rotherham(i) 22 And, after that, went the Levites in, to do their laborious work in the tent of meeting, before Aaron, and before his sons,––as Yahweh commanded Moses concerning the Levites, so, did they unto them. 23 And Yahweh spake unto Moses, saying; 24 This, is what concerneth the Levites,––from twenty–five years old and upwards, shall they enter to take rank in the host, for doing the laborious work of the tent of meeting; 25 but, from the age of fifty years, shall they retire from taking rank in the labour, and shall do laborious work no more; 26 yet shall they wait upon their brethren in the tent of meeting, by keeping charge, but, laborious work, shall they not perform,––thus, shalt thou do unto the Levites, as touching their charges.