'Unclean' in the Bible

Now therefore, be careful not to drink wine or strong drink, nor eat any unclean thing.

But he said to me, ‘Behold, you shall conceive and give birth to a son, and now you shall not drink wine or strong drink nor eat any unclean thing, for the boy shall be a Nazirite to God from the womb to the day of his death.’”

She should not eat anything that comes from the vine nor drink wine or strong drink, nor eat any unclean thing; let her observe all that I commanded.”