Leviticus 15:2-4

2“Speak to Bnei-Yisrael and tell them: When any man has a fluid discharge from his body, because of his discharge he is unclean.

3This is to be his uncleanness in his discharge. Whether his body flows with his discharge or his body obstructs his discharge, it is his uncleanness.

4“Every bed on which he who has the discharge lies will become unclean, and everything he sits on will be unclean.