Leviticus 15:3

15:3 Now this is his uncleanness in regard to his discharge – whether his body secretes his discharge or blocks his discharge, he is unclean. All the days that his body has a discharge or his body blocks his discharge, this is his uncleanness.

Leviticus 5:3

5:3 or when he touches human uncleanness with regard to anything by which he can become unclean, even if he did not realize it, but he himself has later come to know it and is guilty;