The New Testament says so in several places.
Well, it says that His people are His temple and that He dwells in the bodies of His people.
Since (according to the promise of His Word) I am one of His people, it follows that He lives in me.
As I live in my house, He lives in me.
I like that. I’m amazed at that.
But how about this?
“Thy testimonies are very sure: holiness becometh thine house, O LORD, for ever” (Psalm 93:5).
Holiness fits His dwelling place.
As majesty fits a king, so holiness fits God’s dwelling place.
As the song says, “Help me to be holy.”