Yahya related to me from Malik from Yazid ibn Abdullah Qusayt al-Laythi that he saw Said ibn al-Musayyab having a nose-bleed whilepraying. He went off to the room of Umm Salama, the wife of theProphet, may Allah bless him and grant him peace, and water wasbrought to him and he did wudu. He then returned and completed hisprayer.
USC-MSA web (English) reference: Book 2, Hadith 50
Arabic reference: Book 2, Hadith 80