It is narrated from Hazrat Aisha (may Allah be pleased with her) that once Zainab bint Jahsh came to the service of the Prophet (peace and blessings be upon him) and said that her menstrual bleeding continued constantly. The Prophet (peace and blessings be upon him) said: "During the days of menstruation, leave the prayers, then after that, perform ghusl (ritual bath) and do wudu (ablution) at the time of every prayer and offer the prayer, even if drops of blood fall on the mat."