Obligation To Stop Prayer From First Sight Of Menstrual Blood

From Ali bin Ibrahim, from his father, from Ibn Abi Umayr, from Yunus bin Yaqub who said: I said to Abu Abdullah (peace be upon him): A woman sees blood for three or four days? He said: She should leave prayer.

From Abu Abdullah (peace be upon him) who said: (in a hadith) When a woman sees blood during her menstruation days, she leaves prayer. If the blood continues for three days, she is menstruating. If the blood stops after she sees it for a day or two, she should perform ghusl and pray. Then he said: She must make up the prayers of those two days that she left because she was not menstruating.