Abu Dawud
Prayer
Book Number: 002 / Hadith Number: 1360
Narated By Abdullah ibn Abbas : I spent a night with my maternal aunt Maymunah. The Prophet (pbuh) got up to pray at night. He prayed thirteen rak'ahs including two rak'ahs of the dawn prayer. I guessed that he stood in every rak'ah as long as one could recite Surah al-Muzzammil (73).