The priest is to make atonement for the whole congregation of Israel, so that they may be forgiven; for the sin was unintentional and they have brought to the LORD an offering made by fire and a sin offering, presented before the LORD for their unintentional sin.

Hebrews 2:17
For this reason He had to be made like His brothers in every way, so that He might become a merciful and faithful high priest in service to God, in order to make atonement for the sins of the people.

Hebrews 9:7
But only the high priest entered the second room, and then only once a year, and never without blood, which he offered for himself and for the sins the people had committed in ignorance.

Leviticus 4:20
He shall offer this bull just as he did the bull for the sin offering; in this way the priest will make atonement on their behalf, and they will be forgiven.

Deuteronomy 21:21
Then all the men of his city will stone him to death. So you must purge the evil from among you, and all Israel will hear and be afraid.

Ecclesiastes 5:6
Do not let your mouth cause your flesh to sin, and do not tell the messenger that your vow was a mistake. Why should God be angry with your words and destroy the work of your hands?

And the priest shall make an atonement for all the congregation of the children of Israel, and it shall be forgiven them; for it is ignorance: and they shall bring their offering, a sacrifice made by fire to the LORD, and their sin offering before the LORD, for their ignorance: