'Unclean' in the Bible

You are to take with you seven pairs of every clean animal, a male and its mate, and two of the unclean animals, a male and its mate;

From the clean animals, unclean animals, birds, and every creature that crawls on the ground,

And they put a meal ready for him by himself, and for them by themselves, and for the Egyptians who were with him by themselves; because the Egyptians may not take food with the Hebrews, for that would make them unclean.

You are to say, Your servants have been keepers of cattle from our early days up to now, like our fathers; in this way you will be able to have the land of Goshen for yourselves; because keepers of sheep are unclean in the eyes of the Egyptians.

But because you were uncontrolled, the first place will not be yours; for you went up to your father's bed, even his bride-bed, and made it unclean.