Numbers 4:19 in the World English Bible
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;
Context
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:
20 But they shall not go in to see when the holy things are covered, lest they die.