Bible Verses About Communion With God: Holiness essential to

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 agreement 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.