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 11:20

11:20 but a whole month, until it comes out your nostrils and makes you sick, because you have despised the Lord who is among you and have wept before him, saying, “Why did we ever come out of Egypt?”’”

Numbers 19:14

19:14 “‘This is the law: When a man dies in a tent, anyone who comes into the tent and all who are in the tent will be ceremonially unclean seven days.