'Unclean' in the Bible

I am using words in the way of men, because your flesh is feeble: as you gave your bodies as servants to what is unclean, and to evil to do evil, so now give them as servants to righteousness to do what is holy.

With right behaviour as in the day; not in pleasure-making and drinking, not in bad company and unclean behaviour, not in fighting and envy.

I am conscious of this, and am certain in the Lord Jesus, that nothing is unclean in itself; but for the man in whose opinion it is unclean, for him it is unclean.