What Is The Basis For The Sunnah (Rawatib) Prayers Established Along With Fardh Prayers?

What is the basis for the sunnah (rawatib) prayers established along with fardh prayers?

The Prophet Muhammad (saw) established sunnah prayers before and after fardh prayers, and advised it to his ummah, too. For this reason, the regular (rawatib) sunnahs that are performed along with daily prayers should be established as much as possible. Prophet Muhammad (saw) said in a hadith, “If any Muslim servant (of Allah) prays for the sake of Allah twelve rak’ahs (of Sunan) every day, over and above the obligatory ones (two rakats before fajr, four before and two after dhuhr, two after maghrib and two after ‘isha), Allah will build for him a house in Paradise, or a house will be built for him in Paradise.” (Muslim, Salat al-Musafirin, 101) He also said about ‘asr prayer, “May Allah have mercy upon the person who establishes a four-rakat prayer before ‘asr.” (Abu Dawud, Tatawwu’, 8).

In another hadith he said, “The first thing about which the people will be called to account out of their actions on the Day of Judgment is prayer. Our Lord, the Exalted, will say to the angels - though He knows better: Look into the prayer of My servant and see whether he has offered it perfectly or imperfectly. If it is perfect, that will be recorded perfect. If it is defective, He will say: See there are some optional prayers offered by My servant. If there are optional prayer to his credit, He will say: Compensate the obligatory prayer by the optional prayer for My servant. Then all the actions will be considered similarly.” (Abu Dawud, Salat, 151; Tirmidhi, Salat, 193)

Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS