John 20:23

If you remit the sins of any, they are remitted: if you retain them, they are retained."

Matthew 16:19

I will give you the keys of the Realm of heaven; whatever you prohibit on earth will be prohibited in heaven, and whatever you permit on earth will be permitted in heaven."

Matthew 18:18

I tell you truly, Whatever you prohibit on earth will be prohibited in heaven, and whatever you permit on earth will be permitted in heaven.

Mark 2:5-10

When Jesus saw their faith, he said to the paralytic, "My son, your sins are forgiven."

1 Corinthians 5:4

by the authority of our Lord Jesus Christ; I have met with you in spirit, and by the power of our Lord Jesus

Acts 2:38

"Repent," said Peter, "let each of you be baptized in the name of Jesus Christ for the remission of your sins; then you will receive the gift of the holy Spirit.

Acts 10:43

All the prophets testify that everyone who believes in him is to receive remission of sins through his Name."

Acts 13:38-39

So you must understand, my brothers, that remission of sins is proclaimed to you through him,

2 Corinthians 2:6-10

This censure from the majority is severe enough for the individual in question,

Ephesians 2:20

you are a building that rests on the apostles and prophets as its foundation, with Christ Jesus as the cornerstone;

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 Realm of heaven; whatever you prohibit on earth will be prohibited in heaven, and whatever you permit on earth will be permitted in heaven."
Matthew 18:18
I tell you truly, Whatever you prohibit on earth will be prohibited in heaven, and whatever you permit on earth will be permitted in heaven.
Mark 2:5
When Jesus saw their faith, he said to the paralytic, "My son, your sins are forgiven."
Acts 2:38
"Repent," said Peter, "let each of you be baptized in the name of Jesus Christ for the remission of your sins; then you will receive the gift of the holy Spirit.
Acts 10:43
All the prophets testify that everyone who believes in him is to receive remission of sins through his Name."
Acts 13:38
So you must understand, my brothers, that remission of sins is proclaimed to you through him,
1 Corinthians 5:4
by the authority of our Lord Jesus Christ; I have met with you in spirit, and by the power of our Lord Jesus
2 Corinthians 2:6
This censure from the majority is severe enough for the individual in question,
Ephesians 2:20
you are a building that rests on the apostles and prophets as its foundation, with Christ Jesus as the cornerstone;