Leviticus 5:2
Or if a person touches anything unclean--whether the carcass of an unclean wild animal or livestock or crawling creature--even if he is unaware of it, he is unclean and guilty.

Leviticus 5:4
Or if someone swears thoughtlessly with his lips to do anything good or evil--in whatever matter a man may rashly pronounce an oath--even if he is unaware of it, when he later realizes it, he will be guilty.

Leviticus 7:21
If one touches anything unclean, whether human uncleanness, an unclean animal, or any unclean, detestable thing, and then eats any of the meat of the peace offering that belongs to the LORD, that person must be cut off from his people."

Numbers 19:22
Anything the unclean person touches will become unclean, and anyone who touches it will be unclean until evening."

Ezekiel 44:27
And on the day he goes into the sanctuary, into the inner court, to minister in the sanctuary, he must present his sin offering, declares the Lord GOD.