LEV 10:6

6 And Moshe said unto Aharon, and unto El'azar and unto Itamar, his banim, Don't uncover your head, neither rend your clothes; lest ye die, and lest wrath come upon kol HaEdah; but let your brethren, the kol Bais Yisroel, bewail the burning which Hashem hath kindled.