Leviticus 10:6

6 Then Moses said to Aaron and his sons Eleazar and Ithamar, “Do not let your hair become unkempta 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.

Read Leviticus 10:6 Using Other Translations

And Moses said unto Aaron, and unto Eleazar and unto Ithamar, his sons, Uncover not your heads, neither rend your clothes; lest ye die, and lest wrath come upon all the people: but let your brethren, the whole house of Israel, bewail the burning which the LORD hath kindled.
And Moses said to Aaron and to Eleazar and Ithamar his sons, "Do not let the hair of your heads hang loose, and do not tear your clothes, lest you die, and wrath come upon all the congregation; but let your brothers, the whole house of Israel, bewail the burning that the LORD has kindled.
Then Moses said to Aaron and his sons Eleazar and Ithamar, “Do not show grief by leaving your hair uncombed or by tearing your clothes. If you do, you will die, and the LORD ’s anger will strike the whole community of Israel. However, the rest of the Israelites, your relatives, may mourn because of the LORD ’s fiery destruction of Nadab and Abihu.