Exodus 19:21

21And the Lord said to Moses, “Go down and warn the people, lest they break through to the Lord ato look and many of them perish.

Leviticus 10:1-3

The Death of Nadab and Abihu

1Now bNadab and Abihu, the sons of Aaron, ceach took his censer and put fire in it and laid incense on it and offered dunauthorized
Or strange
fire before the Lord, which he had not commanded them.
2And fire fcame out from before the Lord and consumed them, and they died before the Lord. 3Then Moses said to Aaron, “This is what the Lord has said: ‘Among gthose who are near me hI will be sanctified, and before all the people I will be glorified.’” iAnd Aaron held his peace.

Numbers 4:4-5

4This is the service of the sons of Kohath in the tent of meeting: jthe most holy things. 5When the camp is to set out, Aaron and his sons shall go in and take down kthe veil of the screen and cover lthe ark of the testimony with it.

Numbers 4:15

15And when Aaron and his sons have finished covering the sanctuary and all the furnishings of the sanctuary, as the camp sets out, after that mthe sons of Kohath shall come to carry these, nbut they must not touch the holy things, lest they die. These are the things of the tent of meeting that the sons of Kohath are to carry.

Numbers 4:20

20 obut they shall not go in to look on the holy things even for a moment, lest they die.”

Deuteronomy 29:29

29“The secret things belong to the Lord our God, but the things that are revealed belong to us and to our children forever, that we may do all the words of this law.

2 Samuel 6:7

7And the anger of the Lord was kindled against Uzzah, and pGod struck him down there because of his error, and he died there beside the ark of God.
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