Numbers 15:25

15:25 And the priest is to make atonement for the whole community of the Israelites, and they will be forgiven, because it was unintentional and they have brought their offering, an offering made by fire to the Lord, and their purification offering before the Lord, for their unintentional offense.

Numbers 16:46

16:46 Then Moses said to Aaron, “Take the censer, put burning coals from the altar in it, place incense on it, and go quickly into the assembly and make atonement for them, for wrath has gone out from the Lord – the plague has begun!”