Matthew 5:9, 16, 23-24, 44-45

Blessed are the peacemakers: for they shall be called sons of God.

Even so let your light shine before men; that they may see your good works, and glorify your Father who is in heaven.

If therefore thou art offering thy gift at the altar, and there rememberest that thy brother hath aught against thee, leave there thy gift before the altar, and go thy way, first be reconciled to thy brother, and then come and offer thy gift.

but I say unto you, Love your enemies, and pray for them that persecute you; that ye may be sons of your Father who is in heaven: for he maketh his sun to rise on the evil and the good, and sendeth rain on the just and the unjust.