Sunan At-Tirmidhi

Aishah narrated that Allah's Messenger (S) said:""Whoever is regular with twelve Rak'ah of Sunnah (prayer), Allah will build a house for 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