Leviticus 10:6 RSV

[6] And Moses said to Aaron and to Elea′zar and Ith′amar, his sons, "Do not let the hair of your heads hang loose, and do not rend your clothes, lest you die, and lest wrath come upon all the congregation; but your brethren, the whole house of Israel, may bewail the burning which the LORD has kindled.