'Unclean' in the Bible

Now then take care to have no wine or strong drink and to take no unclean thing for food;

But he said to me, You are with child and will give birth to a son; and now do not take any wine or strong drink or let anything unclean be your food; for the child will be separate to God from his birth to the day of his death.

She is to have nothing which comes from the vine for her food, and let her take no wine or strong drink or anything which is unclean; let her take care to do all I have given her orders to do.