James 5:9 (NIV)
Don't grumble against each other, brothers, or you will be judged. The Judge is standing at the door!
2 Timothy 2:22-26 (NIV)
22Flee the evil desires of youth, and pursue righteousness, faith, love and peace, along with those who call on the Lord out of a pure heart.
23Don't have anything to do with foolish and stupid arguments, because you know they produce quarrels.
24And the Lord's servant must not quarrel; instead, he must be kind to everyone, able to teach, not resentful.
25Those who oppose him he must gently instruct, in the hope that God will grant them repentance leading them to a knowledge of the truth,
26and that they will come to their senses and escape from the trap of the devil, who has taken them captive to do his will.
James 5:16 (NIV)
16Therefore confess your sins to each other and pray for each other so that you may be healed. The prayer of a righteous man is powerful and effective.