Numbers 4:17-19

King James Version

¹⁷ And the Lord spake unto Moses and unto Aaron saying,

¹⁸ Cut ye not off the tribe of the families of the Kohathites from among the Levites:

¹⁹ But thus do unto them, that they may live, and not die, when they approach unto the most holy things: Aaron and his sons shall go in, and appoint them every one to his service and to his burden: