“Who is he that overcometh the world, but he that believeth that Jesus is the Son of God? This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth” (1 John 5:5–6).
“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?” (2 Corinthians 13:5).
“The Lord knoweth them that are his” (2 Timothy 2:19).
“Now if any man has not the Spirit of Christ, he is none of his” (Romans 8:9).