Sahih Bukhari
Menstrual Periods
Volume: 001 / Book Number: 006 / Hadith Number: 320
Narrated Um Salama:
While I was lying with the Prophet under a woolen sheet, I got my menses. I slipped away and put on the clothes for menses. The Prophet said, "Have you got your menses?" I replied, "Yes." He called me and I slept with him under the woolen sheet.