Leviticus 5:2

5:2 Or when there is a person who touches anything ceremonially unclean, whether the carcass of an unclean wild animal, or the carcass of an unclean domesticated animal, or the carcass of an unclean creeping thing, even if he did not realize it, but he himself has become unclean and is guilty;

Leviticus 11:28

11:28 and the one who carries their carcass must wash his clothes and be unclean until the evening; they are unclean to you.

Leviticus 11:36

11:36 However, a spring or a cistern which collects water will be clean, but one who touches their carcass will be unclean.

Leviticus 11:27

11:27 All that walk on their paws among all the creatures that walk on all fours are unclean to you. Anyone who touches their carcass will be unclean until the evening,

Leviticus 11:35

11:35 Anything their carcass may fall on will become unclean. An oven or small stove must be smashed to pieces; they are unclean, and they will stay unclean to you.