1 John 4:1-2

Amplified Bible, Classic Edition

4 Beloved, do not put faith in every spirit, but prove (test) the spirits to discover whether they proceed from God; for many false prophets have gone forth into the world.

² By this you may know (perceive and recognize) the Spirit of God: every spirit which acknowledges and confesses [the fact] that Jesus Christ (the Messiah) [actually] has become man and has come in the flesh is of God [has God for its source];