Matthew Henry's Concise Commentary

3:16-17 From other parts of the epistle, it appears that the false teachers among the Corinthians taught unholy doctrines. Such teaching tended to corrupt, to pollute, and destroy the building, which should be kept pure and holy for God. Those who spread loose principles, which render the church of God unholy, bring destruction upon themselves. Christ by his Spirit dwells in all true believers. Christians are holy by profession, and should be pure and clean, both in heart and conversation. He is deceived who deems himself the temple of the Holy Ghost, yet is unconcerned about personal holiness, or the peace and purity of the church.