1 John 4:2

Hereby ye know the Spirit of God: every spirit which confesses Jesus Christ come in flesh is of God;

1 Corinthians 12:3

I give you therefore to know, that no one, speaking in the power of the Spirit of God, says, Curse on Jesus; and no one can say, Lord Jesus, unless in the power of the Holy Spirit.

John 1:14

And the Word became flesh, and dwelt among us (and we have contemplated his glory, a glory as of an only-begotten with a father), full of grace and truth;

John 16:13-15

But when he is come, the Spirit of truth, he shall guide you into all the truth: for he shall not speak from himself; but whatsoever he shall hear he shall speak; and he will announce to you what is coming.

1 Timothy 3:16

And confessedly the mystery of piety is great. God has been manifested in flesh, has been justified in the Spirit, has appeared to angels, has been preached among the nations, has been believed on in the world, has been received up in glory.

1 John 2:23

Whoever denies the Son has not the Father either; he who confesses the Son has the Father also.

1 John 4:3

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

1 John 5:1

Every one that believes that Jesus is the Christ is begotten of God; and every one that loves him that has begotten loves also him that is begotten of 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 which does not confess Jesus Christ come in flesh is not of God: and this is that power of the antichrist, of which ye have heard that it comes, and now it is already in the world.
John 1:14
And the Word became flesh, and dwelt among us (and we have contemplated his glory, a glory as of an only-begotten with a father), full of grace and truth;
1 Timothy 3:16
And confessedly the mystery of piety is great. God has been manifested in flesh, has been justified in the Spirit, has appeared to angels, has been preached among the nations, has been believed on in the world, has been received up in glory.

General references

Deuteronomy 18:21
And if thou say in thy heart, How shall we know the word that Jehovah hath not spoken?
John 8:47
He that is of God hears the words of God: therefore ye hear them not, because ye are not of God.