Leviticus 10:6; Leviticus 10:7

6 Then Moses said to Aaron and his sons Eleazar and Ithamar, “Do not let your hair become unkempt and do not tear your clothes, or you will die and the LORD will be angry with the whole community. But your relatives, all the Israelites, may mourn for those the LORD has destroyed by fire.

7 Do not leave the entrance to the tent of meeting or you will die, because the LORD’s anointing oil is on you.” So they did as Moses said.