'Unclean' in the Bible

I have knowledge of Ephraim, and Israel is not secret from me; for now, O Ephraim, you have been false to me, Israel has become unclean.

In Israel I have seen a very evil thing; there false ways are seen in Ephraim, Israel is unclean;

They will have no resting-place in the Lord's land, but Ephraim will go back to Egypt, and they will take unclean food in Assyria.

They will give no wine offering to the Lord, they will not make offerings ready for him; their bread will be like the bread of those in sorrow; all who take it will be unclean, because their bread will be only for their desire, it will not come into the house of the Lord.