Leviticus 11:8

11:8 You must not eat from their meat and you must not touch their carcasses; they are unclean to you.

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 25:42

25:42 Since they are my servants whom I brought out from the land of Egypt, they must not be sold in a slave sale.