Numbers 15:24-26

24then it shall be, if it be done unwittingly, without the knowledge of the congregation, that all the congregation shall offer one young bullock for a burnt offering, for a sweet savour unto the LORD, with the meal offering thereof, and the drink offering thereof, according to the ordinance, and one he-goat for a sin offering.

25And the priest shall make atonement for all the congregation of the children of Israel, and they shall be forgiven; for it was an error, and they have brought their oblation, an offering made by fire unto the LORD, and their sin offering before the LORD, for their error:

26and all the congregation of the children of Israel shall be forgiven, and the stranger that sojourneth among them; for in respect of all the people it was done unwittingly.