'Unclean' in the Bible

Now therefore beware, I pray thee, and drink no wine nor strong drink, and eat not any unclean thing:

but he said unto me, Behold, thou shalt conceive, and bear a son; and now drink no wine nor strong drink, and eat not any unclean thing; for the child shall be a Nazirite unto God from the womb to the day of his death.

She may not eat of anything that cometh of the vine, neither let her drink wine or strong drink, nor eat any unclean thing; all that I commanded her let her observe.