Numbers 4:18 in the King James Version
Cut ye not off the tribe of the families of the Kohathites from among the Levites:
Context
17 The LORD spoke to Moses and to Aaron, saying,
18 “Don’t cut off the tribe of the families of the Kohathites from among the Levites;
19 but do this to them, that they may live, and not die, when they approach the most holy things: Aaron and his sons shall go in and appoint everyone to his service and to his burden;