but do this in regard 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 each of them to his service and his task.
Numbers 4:19
Surrounding context
4:18 "Do not cut off the tribe of the families of the Kohathites from among the Levites;
4:19 but do this in regard 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 each of them to his service and his task.
4:20 But they shall not go in to watch while the holy things are being covered, lest they die."