The First Letter of John, chapter 1
8If we say we have no sin, we deceive ourselves and the truth is not in us. 9If we confess our sins, God is faithful and just and will forgive us our sins and purify us from all unrighteousness. 10If we claim we have not sinned, we make God out to be a liar and his word has no place in our lives.
The Gospel of John, chapter 20
19On the evening of that first day of the week, when the disciples were together, with the doors locked for fear of the Jews, Jesus came and stood among them and said, “Peace be with you!” 20After he said this, he showed them his hands and side. The disciples were overjoyed when they saw the Lord. 21Again Jesus said, “Peace be with you! As the Father has sent me, I am sending you.” 22And with that he breathed on them and said, “Receive the Holy Spirit. 23If you forgive anyone his sins, they are forgiven; if you do not forgive them, they are not forgiven.”