Leviticus 15:4

1 And the Lord said to Moses and to Aaron,

2 Say to the children of Israel: If a man has an unclean flow from his flesh, it will make him unclean.

3 If the flow goes on or if the part is stopped up, to keep back the flow, he is still unclean.

4 Every bed on which he has been resting will be unclean, and everything on which he has been seated will be unclean.

5 And anyone touching his bed is to have his clothing washed and his body bathed in water and be unclean till evening.

6 And he who has been seated on anything on which the unclean man has been seated is to have his clothing washed and his body bathed in water and be unclean till evening.

7 And anyone touching the flesh of the unclean man is to have his clothing washed and his body bathed in water and be unclean till evening.