Mishkat al-Masabih #521

Asma’ daughter of ‘Umais said she told God’s messenger that Fatima daughter of Abu Hubaish had had a flow of blood for a certain period and had not prayed. God’s messenger said, “Glory be to God! This comes from the devil. She should sit in a tub, and when she sees yellowness appearing on the top of the water she should wash once for the noon and afternoon prayer, once for the sunset and night prayer, once for the dawn prayer, and in between times she should perform ablution.” Abu Dawud transmitted it, saying Mujahid transmitted from Ibn ‘Abbas that when the washing became too much for her be ordered her to combine the two prayers.