William Burkitt on 2 Corinthians 6:16

This form of questions evidently implies the absolute inconsistency between believers and idolaters, and the danger from communion with them. And the apostle's calling believers the temple of the living God, represents both their dignity and duty; their dignity, in having the Spirit of God to dwell in them, and walk in them; their duty, to be purified and adorned for his habitation.

Observe, believers are a spiritual temple, in which the Holy Ghost dwells. This dwelling implies propriety, familiarity, authority, residency, and fixedness of abode.

Observe, 2. That the indwelling presence of the Holy Spirit in good men, as in a temple, being the highest honour and most perfect felicity of the reasonable nature, should oblige them to universal holiness, and to avoid all communion with idolaters.