'Unclean Spirit' in the Bible

And amazement was upon all, and they spake to one another, saying, What this word with authority and power he commands unclean spirits, and they come out.

And those molested with unclean spirits: and they were cured.

For he proclaimed to the unclean spirit to come out of the man. For many times it snatched him: and he was bound with chains, and being guarded with fetters; and bursting the bonds, he was driven by the demon into the deserts.

And he yet coming near, the demon rent him, and tare him. And Jesus censured the unclean spirit, and healed the child, and gave him back to his father.

When the unclean spirit comes out from a man, he passes through places wanting water, seeking rest; and not finding, he says, I will return to my house whence I came out.