'Unclean' in the Bible

Now please be careful not to drink wine or beer, or to eat anything unclean;

He said to me, ‘You will conceive and give birth to a son. Therefore, do not drink wine or beer, and do not eat anything unclean, because the boy will be a Nazirite to God from birth until the day of his death.’”

She must not eat anything that comes from the grapevine or drink wine or beer. And she must not eat anything unclean. Your wife must do everything I have commanded her.”