Numbers 19:3

19:3 You must give it to Eleazar the priest so that he can take it outside the camp, and it must be slaughtered before him.

Numbers 11:20

11:20 but a whole month, until it comes out your nostrils and makes you sick, because you have despised the Lord who is among you and have wept before him, saying, “Why did we ever come out of Egypt?”’”