John 20:23

If you forgive the sins of any, they are forgiven them. If you retain [the sins] of any, they are retained."

Matthew 16:19

I will give you the keys of the kingdom of heaven, and whatever you bind on earth will be bound in heaven, and whatever you release on earth will be released in heaven."

Matthew 18:18

"Truly I say to you, whatever you bind on earth will be bound in heaven, and whatever you release on earth will be released in heaven.

Mark 2:5-10

And [when] Jesus saw their faith, he said to the paralytic, "Child, your sins are forgiven."

1 Corinthians 5:4

In the name of our Lord Jesus, [when] you are assembled, and my spirit, together with the power of our Lord Jesus,

Acts 2:38

And Peter [said] to them, "Repent and be baptized, each one of you, in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.

Acts 10:43

To this one all the prophets testify, [that] through his name everyone who believes in him receives forgiveness of sins."

Acts 13:38-39

"Therefore let it be known to you, men [and] brothers, that through this one forgiveness of sins is proclaimed to you, and from all [the things] from which you were not able to be justified by the law of Moses,

2 Corinthians 2:6-10

This punishment by the majority [is] sufficient for such a person.

Ephesians 2:20

built on the foundation of the apostles and prophets, Christ Jesus himself being the cornerstone,

1 Timothy 1:20

among whom are Hymenaeus and Alexander, whom I have handed over to Satan, in order that they may be taught not to blaspheme.

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
I will give you the keys of the kingdom of heaven, and whatever you bind on earth will be bound in heaven, and whatever you release on earth will be released in heaven."
Matthew 18:18
"Truly I say to you, whatever you bind on earth will be bound in heaven, and whatever you release on earth will be released in heaven.
Mark 2:5
And [when] Jesus saw their faith, he said to the paralytic, "Child, your sins are forgiven."
Acts 2:38
And Peter [said] to them, "Repent and be baptized, each one of you, in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.
Acts 10:43
To this one all the prophets testify, [that] through his name everyone who believes in him receives forgiveness of sins."
Acts 13:38
"Therefore let it be known to you, men [and] brothers, that through this one forgiveness of sins is proclaimed to you, and from all [the things] from which you were not able to be justified by the law of Moses,
1 Corinthians 5:4
In the name of our Lord Jesus, [when] you are assembled, and my spirit, together with the power of our Lord Jesus,
2 Corinthians 2:6
This punishment by the majority [is] sufficient for such a person.
Ephesians 2:20
built on the foundation of the apostles and prophets, Christ Jesus himself being the cornerstone,
1 Timothy 1:20
among whom are Hymenaeus and Alexander, whom I have handed over to Satan, in order that they may be taught not to blaspheme.