Defilement, Ceremonial Causes
Most Relevant Verses
And ye shall make a separation between the clean beast and the unclean, and between the unclean fowl and the clean, and ye shall not make yourselves an abomination by beast, or by fowl, or by anything that creepeth on the ground which I have separated for you, declaring it as unclean.
And Daniel purposed in his heart that he would not pollute himself with the king's delicate food, nor with the wine which he drank; and he requested of the prince of the eunuchs that he might not have to pollute himself.
Speak unto the children of Israel, saying, If a woman conceive seed, and bear a male, then she shall be unclean seven days; as in the days of the separation of her infirmity shall she be unclean.