'Defile' in the Bible

You must not defile yourselves with any swarmer that swarms, and you must not make yourselves unclean by them and [so] be made unclean by them,

And you shall distinguish between the clean and the unclean animal and between the unclean and the clean bird; and you shall not defile yourselves with the animal or with the bird or with anything that moves along the ground that I have set apart for you {as unclean}.

and for his sister, a virgin, [who is] closest to him, {who has not had a husband}--for her he may defile himself.