Numbers 15:25

The priest will make atonement for all of the community of the {Israelites}, and {they will be forgiven} because it [was] unintentional; they will bring their offering, an offering made by fire for Yahweh, their sin offering {before Yahweh} for their unintentional sin.

Leviticus 4:20

He shall do to the bull {just as} he did to the sin offering's bull, so he must do to it. The priest shall make atonement for them, and {they will be forgiven}.

Romans 3:25

whom God made publicly available as the mercy seat through faith in his blood, for a demonstration of his righteousness, because of the passing over of previously committed sins,

Leviticus 4:26

He must turn all of its fat into smoke on the altar like the fat of the fellowship offerings' sacrifice, and the priest shall make atonement for him {because of} his sin, and {he will be forgiven}.

Luke 23:34

[[But Jesus said, "Father, forgive them, for they do not know what they are doing."]] And they cast lots to divide his clothes.

Acts 13:39

by this one everyone who believes is justified!

Hebrews 2:17

Therefore he was obligated to be made like his brothers in all [respects], in order that he could become a merciful and faithful high priest in the things relating to God, in order to make atonement for the sins of the people.

1 John 2:2

and he is the propitiation for our sins, and not for ours only, but also for [the sins of] the whole world.

Treasury of Scripture Knowledge

Summary

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 unto the LORD, and their sin offering before the LORD, for their ignorance:

Forgiven them

General references

Bible References

The priest

Leviticus 4:20
He shall do to the bull {just as} he did to the sin offering's bull, so he must do to it. The priest shall make atonement for them, and {they will be forgiven}.
Romans 3:25
whom God made publicly available as the mercy seat through faith in his blood, for a demonstration of his righteousness, because of the passing over of previously committed sins,
1 John 2:2
and he is the propitiation for our sins, and not for ours only, but also for [the sins of] the whole world.

Forgiven them

Luke 23:34
[[But Jesus said, "Father, forgive them, for they do not know what they are doing."]] And they cast lots to divide his clothes.
Acts 13:39
by this one everyone who believes is justified!

General references

Leviticus 4:19
He must remove all its fat from it, and he shall turn [it] into smoke on the altar.