1 John 4:2

By this ye know the Spirit of God: every spirit that confesses Jesus Christ having come in flesh is of God,

1 Corinthians 12:3

Therefore I make known to you, that no man speaking by the Spirit of God says, Jesus is accursed, and no man can say, Jesus is Lord, except by Holy Spirit.

John 1:14

And the Word became flesh, and dwelt among us. And we beheld his glory, glory as of the only begotten from the Father, full of grace and truth.

John 16:13-15

However when he, the Spirit of truth, comes, he will guide you into all the truth. For he will not speak from himself, but as many things as he may hear, he will speak. And he will report to you the things that are coming.

1 Timothy 3:16

And without controversy great is the mystery of piety. God was manifested in flesh, justified in spirit, seen by heavenly agents, proclaimed among nations, believed in the world, taken up in glory.

1 John 2:23

Every man who denies the Son, also does not have the Father.

1 John 4:3

and every spirit that does not confess Jesus Christ has come in flesh is not of God. And this is that of the antichrist, which ye have heard that it comes, and is now in the world already.

1 John 5:1

Every man who believes that Jesus is the Christ has been begotten from God, and every man who loves him who begot, also loves him who has been begotten from him.

Treasury of Scripture Knowledge

Summary

Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:

General references

Bible References

Come

1 John 4:3
and every spirit that does not confess Jesus Christ has come in flesh is not of God. And this is that of the antichrist, which ye have heard that it comes, and is now in the world already.
John 1:14
And the Word became flesh, and dwelt among us. And we beheld his glory, glory as of the only begotten from the Father, full of grace and truth.
1 Timothy 3:16
And without controversy great is the mystery of piety. God was manifested in flesh, justified in spirit, seen by heavenly agents, proclaimed among nations, believed in the world, taken up in glory.

General references

Deuteronomy 18:21
And if thou say in thy heart, How shall we know the word which LORD has not spoken?
John 8:47
He who is of God hears the sayings of God. Because of this ye do not hear, because ye are not of God.