Leviticus 10:6-7

6Then Moses said to Aaron and to Eleazar and Ithamar his other two sons, “Do not dishevel the hair of your heads and do not tear your garments, so that you do not die and so that wrath does not come on the whole congregation. Your brothers, all the house of Israel, are to mourn the burning which the Lord has caused,

7but you must not go out from the entrance of the Meeting Tent lest you die, for the Lord’s anointing oil is on you.” So they acted according to the word of Moses.