'Unclean' in the Bible

There came also a multitude out of the cities round about unto Jerusalem, bringing sick folks, and them which were vexed with unclean spirits: and they were healed every one.

For unclean spirits, crying with loud voice, came out of many that were possessed with them: and many taken with palsies, and that were lame, were healed.

But Peter said, Not so, Lord; for I have never eaten any thing that is common or unclean.

And he said unto them, Ye know how that it is an unlawful thing for a man that is a Jew to keep company, or come unto one of another nation; but God hath shewed me that I should not call any man common or unclean.

But I said, Not so, Lord: for nothing common or unclean hath at any time entered into my mouth.