'Unclean' in the Bible

They will fling their silver into the streets and their gold will be [discarded] like something unclean; their silver and their gold shall not be able to save them in the day of the wrath of the Lord. These [things] cannot satisfy their soul nor fill their stomachs, for they have become their stumbling block and source of sin.

As for the beauty of [gold for] ornaments, they turned it to pride and from it made the images of their repulsive things (idols) and of their vile things. Therefore I will make it an unclean thing to them.

and I pronounced them unclean because of their offerings [to their idols], in that they made all their firstborn pass through the fire [as pagan sacrifices], so that I might make them desolate, in order that they might know [without any doubt] that I am the Lord.”’

In you men have uncovered their fathers’ nakedness [the nakedness of mother or stepmother]; in you they have violated women who are [set apart as ceremonially] unclean during their menstrual impurity [or after childbirth].

Her priests have done violence to My law and have profaned My holy things. They have made no distinction between the holy (sacred) and the profane (secular), they have not taught [people] the difference between the unclean and the clean; and they hide their eyes from My Sabbaths, and I am profaned among them.

The priests shall teach My people the difference between the holy and the common, and teach them to distinguish between the (ceremonially) unclean and the clean.