'Unclean' in the Bible

He shall not make himself [ceremonially] unclean for his father, mother, brother, or sister, when they die, because [the responsibility for] his separation to God is on his head.

“Say to the Israelites, ‘If any one of you or of your descendants becomes [ceremonially] unclean because of [touching] a dead body or is on a distant journey, he may, however, observe the Passover to the Lord.

Every firstborn of the womb of all flesh, whether it is man or animal, which they bring to the Lord, shall be yours; nevertheless, the firstborn of man you shall most certainly redeem, and the firstborn of unclean animals you shall redeem.

Then the priest shall wash his clothes and bathe his body in water; and afterward come into the camp, but he shall be [ceremonially] unclean until evening.

The one who burns the heifer shall wash his clothes and bathe his body in water, and shall be unclean until evening.

The one who gathers the ashes of the heifer shall wash his clothes, and be unclean until evening. This shall be a perpetual statute to the Israelites and to the stranger who lives as a resident alien among them.

‘The one who touches the dead body of any person shall be unclean for seven days.

Whoever touches a corpse, the body of anyone who has died, and does not purify himself, defiles the tabernacle of the Lord; and that person shall be cut off from Israel [that is, excluded from the atonement made for them]. Because the water for impurity was not sprinkled on him, he shall be unclean; his uncleanness is still on him.

‘This is the law when a man dies in a tent: everyone who comes into the tent and everyone who is in the tent shall be [ceremonially] unclean for seven days.

Every open container [in the tent], which has no covering tied down on it, is unclean.

Also, anyone in the open field who touches one who has been killed with a sword or who has died [of natural causes], or a human bone or a grave, shall be unclean for seven days.

Then for the unclean person they shall take some of the ashes of the heifer burnt for the purification from sin, and running water shall be added to them in a container.

Then the clean person shall sprinkle [the water for purification] on the unclean person on the third day and on the seventh day, and on the seventh day the unclean man shall purify himself, and wash his clothes and bathe himself in water, and shall be [ceremonially] clean at evening.

‘But the man who is unclean and does not purify himself, that person shall be cut off from among the assembly, because he has defiled the sanctuary of the Lord. The water for purification has not been sprinkled on him; he is unclean.

So it shall be a perpetual statute to them. He who sprinkles the water for impurity [on another] shall wash his clothes, and he who touches the water for impurity shall be unclean until evening.

Furthermore, anything the unclean person touches shall be unclean, and anyone who touches it shall be [ceremonially] unclean until evening.’”