1 John 4:2

By this you may have knowledge of the Spirit of God: every spirit which says that Jesus Christ has come in the flesh is of God:

1 Corinthians 12:3

So it is my desire for you to be clear about this; that no one is able to say by the Spirit of God that Jesus is cursed; and no one is able to say that Jesus is Lord, but by the Holy Spirit.

John 1:14

And so the Word became flesh and took a place among us for a time; and we saw his glory--such glory as is given to an only son by his father--saw it to be true and full of grace.

John 16:13-15

However, when he, the Spirit of true knowledge, has come, he will be your guide into all true knowledge: for his words will not come from himself, but whatever has come to his hearing, that he will say: and he will make clear to you the things to come.

1 Timothy 3:16

And without argument, great is the secret of religion: He who was seen in the flesh, who was given God's approval in the spirit, was seen by the angels, of whom the good news was given among the nations, in whom the world had faith, who was taken up in glory.

1 John 2:23

He who has no belief in the Son has not the Father: he who makes clear his belief in the Son has the Father.

1 John 4:3

And every spirit which does not say this is not from God: this is the spirit of Antichrist, of which you have had word; and it is in the world even now.

1 John 5:1

Everyone who has faith that Jesus is the Christ is a child of God: and everyone who has love for the Father has love for his child.

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 say this is not from God: this is the spirit of Antichrist, of which you have had word; and it is in the world even now.
John 1:14
And so the Word became flesh and took a place among us for a time; and we saw his glory--such glory as is given to an only son by his father--saw it to be true and full of grace.
1 Timothy 3:16
And without argument, great is the secret of religion: He who was seen in the flesh, who was given God's approval in the spirit, was seen by the angels, of whom the good news was given among the nations, in whom the world had faith, who was taken up in glory.

General references

Deuteronomy 18:21
And if you say in your hearts, How are we to be certain that the word does not come from the Lord?
John 8:47
He who is a child of God gives ear to the words of God: your ears are not open to them because you are not from God.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain