1 John 4:15 in the King James Version
Whosoever shall confess that Jesus is the Son of God, God dwelleth in him, and he in God.
Context
14 We have seen and testify that the Father has sent the Son as the Savior of the world.
15 Whoever confesses that Jesus is the Son of God, God remains in him, and he in God.
16 We know and have believed the love which God has for us. God is love, and he who remains in love remains in God, and God remains in him.