Leviticus 15:15-25

15 The priest shall offer them, one for a sin offering and the other for a burnt offering; and the priest shall make atonement on his behalf before the Lord for his discharge.
16 If a man has an emission of semen, he shall bathe his whole body in water, and be unclean until the evening.
17 Everything made of cloth or of skin on which the semen falls shall be washed with water, and be unclean until the evening.
18 If a man lies with a woman and has an emission of semen, both of them shall bathe in water, and be unclean until the evening.
19 When a woman has a discharge of blood that is her regular discharge from her body, she shall be in her impurity for seven days, and whoever touches her shall be unclean until the evening.
20 Everything upon which she lies during her impurity shall be unclean; everything also upon which she sits shall be unclean.
21 Whoever touches her bed shall wash his clothes, and bathe in water, and be unclean until the evening.
22 Whoever touches anything upon which she sits shall wash his clothes, and bathe in water, and be unclean until the evening;
23 whether it is the bed or anything upon which she sits, when he touches it he shall be unclean until the evening.
24 If any man lies with her, and her impurity falls on him, he shall be unclean seven days; and every bed on which he lies shall be unclean.
25 If a woman has a discharge of blood for many days, not at the time of her impurity, or if she has a discharge beyond the time of her impurity, all the days of the discharge she shall continue in uncleanness; as in the days of her impurity, she shall be unclean.