'Uncleanness' in the Bible

The priest shall cause her to swear, and shall tell the woman, "If no man has lain with you, and if you haven't gone aside to uncleanness, being under your husband, be free from this water of bitterness that brings a curse.

Whoever touches a dead person, the body of a man who has died, and doesn't purify himself, defiles the tabernacle of Yahweh; and that soul shall be cut off from Israel: because the water for impurity was not sprinkled on him, he shall be unclean; his uncleanness is yet on him.