Bulugh al-Maram#168
وَعَنْ حَمْنَةَ بِنْتِ جَحْشٍ قَالَتْ: { كُنْتُ أُسْتَحَاضُ حَيْضَةً كَبِيرَةً شَدِيدَةً, فَأَتَيْتُ اَلنَّبِيَّ - صلى الله عليه وسلم -أَسْتَفْتِيهِ, فَقَالَ: "إِنَّمَا هِيَ رَكْضَةٌ مِنَ اَلشَّيْطَ...
It is narrated by Hadrat Hamnah bint Jahsh that 'I had a very strong prolonged flow of blood. I went to the Noble Prophe...