Satan
Matthew 12:26
And if Satan cast out Satan, he is divided against himself; how shall then his kingdom stand?
ye say
Luke 11:15
But some of them said, He casteth out devils through Beelzebub the chief of the devils.
Matthew 12:31-34
31
Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men.
32
And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, neither in the world to come.
33
Either make the tree good, and his fruit good; or else make the tree corrupt, and his fruit corrupt: for the tree is known by his fruit.
34
O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
James 3:5-8
5
Even so the tongue is a little member, and boasteth great things. Behold, how great a matter a little fire kindleth!
6
And the tongue is a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell.
7
For every kind of beasts, and of birds, and of serpents, and of things in the sea, is tamed, and hath been tamed of mankind:
8
But the tongue can no man tame; it is an unruly evil, full of deadly poison.