Numbers 1:51

1:51 Whenever the tabernacle is to move, the Levites must take it down, and whenever the tabernacle is to be reassembled, the Levites must set it up. Any unauthorized person who approaches it must be killed.

Numbers 3:10

3:10 So you are to appoint Aaron and his sons, and they will be responsible for their priesthood; but the unauthorized person who comes near must be put to death.”

Numbers 17:5

17:5 And the staff of the man whom I choose will blossom; so I will rid myself of the complaints of the Israelites, which they murmur against you.”

Numbers 17:12-13

17:12 The Israelites said to Moses, “We are bound to die! We perish, we all perish! 17:13 (17:28) Anyone who even comes close to the tabernacle of the Lord will die! Are we all to die?”