Leviticus 11:24, 43-44

“These will make you unclean. Whoever touches their carcasses will be unclean  until evening

Do not become contaminated by any creature that swarms; do not become unclean or defiled by them. For I am the LORD your God,  so you must consecrate yourselves  and be holy because I am holy.  Do not defile yourselves by any swarming creature that crawls on the ground.