2 Corinthians 6:14-16

Be not unequally yoked with unbelievers: for what fellowship have righteousness and iniquity? or what communion hath light with darkness? And what concord hath Christ with Belial? or what portion hath a believer with an unbeliever? And what agreement hath a temple of God with idols? for we are a temple of the living God; even as God said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people.