'Unclean Spirit' in the Bible

And all were amazed; and they spoke with one another, saying, What kind of word is this, that with authority and power he commandeth the unclean spirits, and they come out?

And they that were harassed with unclean spirits were cured.

For he was about to command the unclean spirit to come out of the man; for it had possessed him for a long time, and he had been kept bound and secured with chains and fetters; and bursting the bands, he had been driven by the demon into the wilderness.

And while he was yet coming, the demon threw him down, and convulsed him. But Jesus rebuked the unclean spirit, and healed the child, and delivered him to his father.

When the unclean spirit is gone out from a man, it goeth through dry places, seeking rest; and finding none, it saith, I will return to my house whence I came out.