John 20:23

Whosever sins you forgive, they are forgiven them: whosever sins you retain, they are retained.

Matthew 16:19

And I will give to you the keys of the kingdom of heaven; and whatever you shall bind on earth, shall be bound in heaven; and whatever you shall loose on earth, shall be loosed in heaven.

Matthew 18:18

Verily, I say to you, my disciples, Whatever you bind on earth, shall be bound in heaven; and whatever you loose on earth, shall be loosed in heaven.

Mark 2:5-10

And Jesus, seeing their faith, said to the paralytic: Son, your sins are forgiven you.

1 Corinthians 5:4

in the name of our Lord Jesus Christ, when you and my spirit have come together, with the power of our Lord Jesus Christ,

Acts 2:38

And Peter said to them: Repent, and be immersed, every one of you, in the name of Jesus Christ, in order to the remission of sins; and you shall receive the gift of the Holy Spirit.

Acts 10:43

To him all the prophets bear testimony, that whoever believes on him shall receive remission of sins through his name.

Acts 13:38-39

Be it known to you, therefore, brethren, that through this man is preached to you the remission of sins:

2 Corinthians 2:6-10

Sufficient for such a one is the punishment, which was inflicted by the greater number:

Ephesians 2:20

having been builded upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner-stone,

1 Timothy 1:20

whom I have delivered to Satan, that they may learn not to revile.

Treasury of Scripture Knowledge

Summary

Whose soever sins ye remit, they are remitted unto them; and whose soever sins ye retain, they are retained.

Bible References

General references

Matthew 16:19
And I will give to you the keys of the kingdom of heaven; and whatever you shall bind on earth, shall be bound in heaven; and whatever you shall loose on earth, shall be loosed in heaven.
Matthew 18:18
Verily, I say to you, my disciples, Whatever you bind on earth, shall be bound in heaven; and whatever you loose on earth, shall be loosed in heaven.
Mark 2:5
And Jesus, seeing their faith, said to the paralytic: Son, your sins are forgiven you.
Acts 2:38
And Peter said to them: Repent, and be immersed, every one of you, in the name of Jesus Christ, in order to the remission of sins; and you shall receive the gift of the Holy Spirit.
Acts 10:43
To him all the prophets bear testimony, that whoever believes on him shall receive remission of sins through his name.
Acts 13:38
Be it known to you, therefore, brethren, that through this man is preached to you the remission of sins:
1 Corinthians 5:4
in the name of our Lord Jesus Christ, when you and my spirit have come together, with the power of our Lord Jesus Christ,
2 Corinthians 2:6
Sufficient for such a one is the punishment, which was inflicted by the greater number:
Ephesians 2:20
having been builded upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner-stone,
1 Timothy 1:20
whom I have delivered to Satan, that they may learn not to revile.