Leviticus 11:24, 28, 31, 39

‘By these, moreover, you will be made unclean: whoever touches their carcasses becomes unclean until evening

and the one who picks up their carcasses shall wash his clothes and be unclean until evening; they are unclean to you.

These are to you the unclean among all the swarming things; whoever touches them when they are dead becomes unclean until evening.

‘Also if one of the animals dies which you have for food, the one who touches its carcass becomes unclean until evening.