This question is inspired by the question What is the Old Testament basis to the idea that only God can forgive sins? What is the Biblical basis (Old or New Testament) for the idea that men can be given the authority to forgive sins?
What is the Biblical basis of the idea that men can be given authority to forgive sins?
St. John speaks of it in his Gospel (John 20:19-23):
19 On the evening of that first day of the week, when the disciples were together, with the doors locked for fear of the Jewish leaders, Jesus came and stood among them and said, “Peace be with you!” 20 After he said this, he showed them his hands and side. The disciples were overjoyed when they saw the Lord.
21 Again Jesus said, “Peace be with you! As the Father has sent me, I am sending you.” 22 And with that he breathed on them and said, “Receive the Holy Spirit. 23 If you forgive anyone’s sins, their sins are forgiven; if you do not forgive them, they are not forgiven.”
St. Matthew also speaks of this in his Gospel (Matthew 18:15–18):
15 “If your brother or sister sins, go and point out their fault, just between the two of you. If they listen to you, you have won them over. 16 But if they will not listen, take one or two others along, so that ‘every matter may be established by the testimony of two or three witnesses.’ 17 If they still refuse to listen, tell it to the church; and if they refuse to listen even to the church, treat them as you would a pagan or a tax collector.
18 “Truly I tell you, whatever you bind on earth will be[d] bound in heaven, and whatever you loose on earth will be loosed in heaven.
St. James speaks of this in his Epistle (James 5:13-15):
13 Is any of you sad? Let him pray. Is he cheerful in mind? Let him sing.
14 Is any man sick among you? Let him bring in the priests of the church, and let them pray over him, anointing him with oil in the name of the Lord.
15 And the prayer of faith shall save the sick man: and the Lord shall raise him up: and if he be in sins, they shall be forgiven him.
St. Paul speaks as follows in 2 Corinthians 2:10:
10 And to whom you have pardoned any thing, I also. For, what I have pardoned, if I have pardoned any thing, for your sakes have I done it in the person of Christ.