"Whoever prays twelve rak'ahs during the night and day other than the prescribed prayers, a house will be built for him in Paradise: four before Zuhr and two rak'ahs afterward, two before Asr, two after Maghrib and two before Fajr."
Reference: Sunan an-Nasa'i 1803 In-book : Book 20, Hadith 206 English translation : Vol. 2, Book 20, Hadith 1804
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