When a woman has a discharge consisting of blood from her body, she will be unclean due to her menstruation for seven days, and anyone who touches her will be unclean until evening.
Jewish Publication Society of America Version (JPS1917) - Leviticus 15:19 >And if a woman have an issue, and her issue in her flesh be blood, she shall be in her impurity seven days; and whosoever toucheth her shall be unclean until the even.