Leviticus 5:1-2

Amplified Bible, Classic Edition

5 If anyone sins in that he is sworn to testify and has knowledge of the matter, either by seeing or hearing of it, but fails to report it, then he shall bear his iniquity and willfulness.

² Or if anyone touches an unclean thing, whether the carcass of an unclean wild beast or of an unclean domestic animal or of unclean creeping things that multiply prolifically, even if he is unaware of it, and he has become unclean, he is guilty.