John 14:13-15 KJV
And whatsoever ye shall ask in my name, that will I do, that the Father may be glorified in the Son.  If ye shall ask any thing in my name, I will do it.  If ye love me, keep my commandments.
James 5:16 KJV
Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.
1 John 1:6-9 KJV
If we say that we have fellowship with him, and walk in darkness, we lie, and do not the truth:  But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.  If we say that we have no sin, we deceive ourselves, and the truth is not in us.  If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.