Bible Verses About Aaron: Forbidden to mourn the death of his sons, Nadab and Abihu

And Moses said unto Aaron, and unto Eleazar and unto Ithamar, his sons, Let not the hair of your heads go loose, neither rend your clothes; that ye die not, and that he be not wroth with all the congregation: but let your brethren, the whole house of Israel, bewail the burning which Jehovah hath kindled.

And Aaron spake unto Moses, Behold, this day have they offered their sin-offering and their burnt-offering before Jehovah; and there have befallen me such things as these: and if I had eaten the sin-offering to-day, would it have been well-pleasing in the sight of Jehovah?