Matthew 12:26
"If Satan casts out Satan, he is divided against himself; how then will his kingdom stand?
ye say
Luke 11:15
But some of them said, "He casts out demons by Beelzebul, the ruler of the demons."
Matthew 12:31-34
"Therefore I say to you, any sin and blasphemy shall be forgiven people, but blasphemy against the Spirit shall not be forgiven.
"Whoever speaks a word against the Son of Man, it shall be forgiven him; but whoever speaks against the Holy Spirit, it shall not be forgiven him, either in this age or in the [age] to come.
"Either make the tree good and its fruit good, or make the tree bad and its fruit bad; for the tree is known by its fruit.
"You brood of vipers, how can you, being evil, speak what is good? For the mouth speaks out of that which fills the heart.
James 3:5-8
So also the tongue is a small part of the body, and [yet] it boasts of great things. See how great a forest is set aflame by such a small fire!
And the tongue is a fire, the [very] world of iniquity; the tongue is set among our members as that which defiles the entire body, and sets on fire the course of [our] life, and is set on fire by hell.
For every species of beasts and birds, of reptiles and creatures of the sea, is tamed and has been tamed by the human race.
But no one can tame the tongue; [it is] a restless evil [and] full of deadly poison.