It is narrated from Marjanah, who is the mother of Alqamah and the freed slave of Sayyidah Aisha (may Allah be pleased with her), that women used to send cotton pads in boxes to Sayyidah Aisha (may Allah be pleased with her) to show her, and there would be a yellowish tinge on the cotton from menstrual blood. They would ask whether they should pray or not. Sayyidah Aisha (may Allah be pleased with her) would say: Do not be hasty in the matter of prayer, until you see the white discharge. By this she meant: become pure from menstruation.