"I asked Aishah about the Salat of Allah's Messenger (S). She said: 'He would pray four Rak'ah before Az-Zuhr and two Rak'ah after it, and two after Al-Maghrib, and two Rak'ah after Al-Isha, and two before Al-Fajr."
Jami` at-Tirmidhi Book 2, Hadith 289