Leviticus 15:4

2“Speak to the children of Israel, and tell them, ‘When any man has a discharge from his body, because of his discharge he is unclean.

3This shall be his uncleanness in his discharge: whether his body runs with his discharge, or his body has stopped from his discharge, it is his uncleanness.

4“‘Every bed on which he who has the discharge lies shall be unclean; and everything he sits on shall be unclean.

5Whoever touches his bed shall wash his clothes, and bathe himself in water, and be unclean until the evening.

6He who sits on anything on which the man who has the discharge sat shall wash his clothes, and bathe himself in water, and be unclean until the evening.