17And Jehovah spake unto Moses and unto Aaron, saying,
18Cut ye not off the tribe of the families of the Kohathites from among the Levites;
19but 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;
20but they shall not go in to see the sanctuary even for a moment, lest they die.
22Take the sum of the sons of Gershon also, by their fathers` houses, by their families;
23from thirty years old and upward until fifty years old shalt thou number them; all that enter in to wait upon the service, to do the work in the tent of meeting.