Reconciliation appears in the Sermon on the Mount, in 2 Corinthians 5, and in Romans 12.
In Matthew 5:23-24:
23 Therefore if thou bring thy gift to the altar, and there rememberest that thy brother hath ought against thee; 24 Leave there thy gift before the altar, and go thy way; first be reconciled to thy brother, and then come and offer thy gift.
18 And all things are of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation;
In Romans 12:18:
18 If it be possible, as much as lieth in you, live peaceably with all men.