'Unclean Spirit' in the Bible

And they were all amazed, and spake among themselves, saying, What word is this, that with authority and power he commandeth the unclean spirits, and they come out!

And they that were vexed with unclean spirits; and they were healed.

(For he had commanded the unclean spirit to come out of the man: for many times it had caught him, and he had been kept bound with chains and fetters, and breaking the bands asunder, he had been driven by the spirit into the deserts.)

And as he was yet coming, the devil threw him down and tore him: and Jesus rebuked the unclean spirit, and healed the child, and delivered him again to his father.

When the unclean spirit is gone out of a man, he walketh thro' dry places, seeking rest: and finding none, he saith, I will return to my house whence I came out.