II Corinthians 5:17-21

Therefore if any man be in Christ, he is a new creature: old things
are passed away; behold, all things are become new. And all 
things are are of God, who hath reconciled us to himself by
Jesus Christ, and hath given to us the ministry of reconciliation;

To wit, that God was in Christ, reconciling the world unto himself,
not imputing their trespasses unto theml and hath committed unto
us the word of reconciliation.

Now then we are ambassadors for Christ, as though God did
beseech you by us: we pray you in Christ's stead, be ye 
reconciled to God.

For he hath made him (Christ) to be sin for us, who knew no
sin; that we might be made the righteousness of God in him.

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II Corinthians 6:14-18
Be ye not unequally yoked together with unbelievers: for
what fellowship hath righteousness with unrighteousness?
and what communion hath light with darkness?
And what concord hath Christ with Belial? or what part hath he 
that believeth with an infidel? And what agreemetn hath the 
temple of  God with idols? for ye are the temple of the living
God; as God hath said, I will dwell in them, and walk in them; 
and I will be their God, and they shall be my people.

Wherefore come out from among them, and be ye separate, 
saith the Lord, and touch not the unclean thing; and I will 
receive you, And will be a Father unto you, and ye shall be
my sons and my daughters, saith the Lord Almighty.