1 Corinthians 6:15
Know ye not that your bodies are the members of Christ? shall I then take the members of Christ, and make [them] the members of an harlot? God forbid.
2 Corinthians 13:5
Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates?
For we are members of his body, of his flesh, and of his bones.
1 John 2:5
But whoso keepeth his word, in him verily is the love of God perfected: hereby know we that we are in him.
1 John 4:13
Hereby know we that we dwell in him, and he in us, because he hath given us of his Spirit.