John 20:20-23
20 When he had said this, he showed them his hands and his side. The disciples rejoiced when they saw the Lord.
21 (Jesus) said to them again, "Peace be with you. As the Father has sent me, so I send you."
22 And when he had said this, he breathed on them and said to them, "Receive the holy Spirit.
23 Whose sins you forgive are forgiven them, and whose sins you retain are retained."
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2 Corinthians 5:18-21
18 All this is from God, who through Christ reconciled us to himself and gave us the ministry of reconciliation;
19 that is, in Christ God was reconciling the world to himself, not counting their trespasses against them, and entrusting to us the message of reconciliation.
20 So we are ambassadors for Christ, God making his appeal through us. We beseech you on behalf of Christ, be reconciled to God.
21 For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God.
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Matthew 18:20
20 For where two or three are gathered together in my name, there am I in the midst of them.