"Whoever prays twelve Rak'ah in a day and night, a house will be built from him in Paradise: Four Rak'ah before Zuhr, two Rak'ah after it, two Rak'ah after Maghrib, two Rak'ah after Isha, and two Rak'ah before Fajr in the morning Salat."
Jami` at-Tirmidhi Book 2, Hadith 268