John 20:23

whose soever sins ye forgive, they are forgiven them; and whose sins soever ye retain, they are retained.

Matthew 16:19

And I will give thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven; and whatsoever thou shalt loose on earth shall be loosed in heaven.

Matthew 18:18

Verily I say unto you, Whatsoever things ye shall bind on earth, shall be bound in heaven: and whatsoever things ye shall loose on earth shall be loosed in heaven.

Mark 2:5-10

Then Jesus beholding their faith, saith to the paralytic, Son, thy sins are forgiven thee.

1 Corinthians 5:4

in the name of our Lord Jesus Christ, ye being assembled together and my spirit with the power of our Lord Jesus Christ,

Acts 2:38

Then Peter said unto them, Repent, and be baptised every one of you into the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.

Acts 10:43

To him bear all the prophets witness, that through his name every one who believeth in him, shall receive remission of sins.

Acts 13:38-39

Be it therefore known unto you, men and brethren, that through this man remission of sin is proclaimed to you:

2 Corinthians 2:6-10

Sufficient for such person is that chastisement which hath been inflicted by the majority of you.

Ephesians 2:20

built up on the foundation of apostles and prophets, Jesus Christ himself being the chief corner stone;

1 Timothy 1:20

of whom are Hymeneus and Alexander, whom I have delivered over unto Satan, that they may be corrected, so as to blaspheme no more.

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 thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven; and whatsoever thou shalt loose on earth shall be loosed in heaven.
Matthew 18:18
Verily I say unto you, Whatsoever things ye shall bind on earth, shall be bound in heaven: and whatsoever things ye shall loose on earth shall be loosed in heaven.
Mark 2:5
Then Jesus beholding their faith, saith to the paralytic, Son, thy sins are forgiven thee.
Acts 2:38
Then Peter said unto them, Repent, and be baptised every one of you into the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
Acts 10:43
To him bear all the prophets witness, that through his name every one who believeth in him, shall receive remission of sins.
Acts 13:38
Be it therefore known unto you, men and brethren, that through this man remission of sin is proclaimed to you:
1 Corinthians 5:4
in the name of our Lord Jesus Christ, ye being assembled together and my spirit with the power of our Lord Jesus Christ,
2 Corinthians 2:6
Sufficient for such person is that chastisement which hath been inflicted by the majority of you.
Ephesians 2:20
built up on the foundation of apostles and prophets, Jesus Christ himself being the chief corner stone;
1 Timothy 1:20
of whom are Hymeneus and Alexander, whom I have delivered over unto Satan, that they may be corrected, so as to blaspheme no more.