Defilement, Ceremonial Causes
Most Relevant Verses
'You are therefore to make a distinction between the clean animal and the unclean, and between the unclean bird and the clean; and you shall not make yourselves detestable by animal or by bird or by anything that creeps on the ground, which I have separated for you as unclean.
But Daniel made up his mind that he would not defile himself with the king's choice food or with the wine which he drank; so he sought permission from the commander of the officials that he might not defile himself.
"Speak to the sons of Israel, saying: 'When a woman gives birth and bears a male child, then she shall be unclean for seven days, as in the days of her menstruation she shall be unclean.