Numbers 4:20 in the King James Version
But they shall not go in to see when the holy things are covered, lest they die.
Context
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;
20 but they shall not go in to see the sanctuary even for a moment, lest they die.”
21 The LORD spoke to Moses, saying,