Hadith 637: "I was with the Messenger of Allah (saw) under his blanket, then I felt that I was menstruating as women do, so I slipped out from under the cover. The Messenger of Allah (saw) said: 'Are you menstruating?' I said: 'I feel that I am menstruating as women do.' He said: 'That is what Allah has decreed for the daughters of Adam.' So I slipped out and sorted myself out, then I came back, and the Messenger of Allah (saw) said to me: 'Come under the cover with me,' so I went in with him.'"