Numbers 15:24
Then it shall be, if ought be committed by ignorance 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 his meat offering, and his drink offering, according to the manner, and one kid of the goats for a sin offering.
Cross-references
Leviticus 4:13 is the parallel law for the whole congregation sinning unintentionally — identical situation to Numbers 15:24.
Leviticus 4:14-21 details the sin offering ritual for the congregation's unintentional sin, which Numbers 15:24 summarizes.
2 Chronicles 29:21-24 records Hezekiah's sin offering for all Israel — a larger-scale application of the congregational sin offering in Numbers 15:24.
Acts 3:17 applies this concept of ignorance to the crucifixion — Peter says they acted in ignorance, as this law provides atonement.
Ezra 6:17 describes a sin offering of twelve goats for all Israel at the temple dedication — echoing the congregational sin offering in Numbers 15:24.
Leviticus 4:23 prescribes a goat for a leader's unintentional sin — similar to the goat offering in Numbers 15:24 but for a different person.