1 Corinthians 12:3

Therefore I tell you that no one who is speaking by the Spirit of God says, "Jesus be cursed," and no one can say, "Jesus is Lord," except by the Holy Spirit.

1 John 4:1-3

Beloved, do not believe every spirit, but test the spirits to see whether they are of God; because many false prophets have gone out into the world.

Revelation 16:13-14

And I saw coming out of the mouth of the dragon and out of the mouth of the beast and out of the mouth of the false prophet, three unclean spirits like frogs;

Treasury of Scripture Knowledge

Summary

To whom hast thou uttered words? and whose spirit came from thee?

Bible References

Whose spirit

1 Corinthians 12:3
Therefore I tell you that no one who is speaking by the Spirit of God says, "Jesus be cursed," and no one can say, "Jesus is Lord," except by the Holy Spirit.
1 John 4:1
Beloved, do not believe every spirit, but test the spirits to see whether they are of God; because many false prophets have gone out into the world.
Revelation 16:13
And I saw coming out of the mouth of the dragon and out of the mouth of the beast and out of the mouth of the false prophet, three unclean spirits like frogs;