Leviticus 5:15
"If someone acts unfaithfully and sins unintentionally against any of the LORD's holy things, he must bring his guilt offering to the LORD: an unblemished ram from the flock, of proper value in silver shekels according to the sanctuary shekel; it is a guilt offering.

Numbers 5:4
The Israelites did this, sending such people outside the camp. They did just as the LORD had instructed Moses.

Numbers 5:6
"Tell the Israelites that when a man or woman acts unfaithfully against the LORD by committing any sin against another, that person is guilty