A.T. Robertson Commentary 1 Corinthians 3:16

"Know ye not that ye are a temple of God, and [that] the Spirit of God dwelleth in you?" — 1 Corinthians 3:16 (ASV)

Ye are a temple of God (ναος θεου εστε). Literally, a sanctuary (ναος, not ιερον, the sacred enclosure, but the holy place and the most holy place) of God. The same picture of building as in verse 9 (οικοδομη), only here the sanctuary itself.

Dwelleth in you (εν υμιν οικε). The Spirit of God makes his home (οικε) in us, not in temples made with hands (Acts 7:48; Acts 17:24).