Numbers 15:24-26

²⁴It shall be that if anything be hid from the eyes of the congregation and you do ignorantly, then all the congregation shall make a burnt offering of one young bullock, to be received with acceptance before the Lord, with his mincha and his libation, according to the proper manner, and one kid of the goats for a sin offering:

²⁵And the priest shall make atonement for all the congregation of the sons of Israel, and it shall be forgiven them, for it was ignorance; but they shall bring their oblation before the Lord on account of their ignorance.

²⁶And it shall be forgiven to all the congregation of the children of Israel, and to the sojourners who sojourn among them; for all the people (were) in ignorance.