عَنْ أَبِي ذَرٍّ رَضِيَ اللَّهُ عَنْهُ قَالَ أَوْصَانِي حِبِّي بِثَلَاثٍ لَا أَدَعُهُنَّ إِنْ شَاءَ اللَّهُ أَبَدًا أَوْصَانِي بِصَلَاةِ الضُّحَى وَبِالْوِتْرِ قَبْلَ النَّوْمِ وَبِصِيَامِ ثَلَاثَةِ أَيَّامٍ مِنْ كُلِّ شَهْرٍ
It is narrated from Sayyiduna Abu Dharr (may Allah be pleased with him), he says: My beloved (peace and blessings be upon him) advised me regarding three things, by Allah’s will I will never abandon them. The Prophet (peace and blessings be upon him) advised me to perform the Duha prayer, to perform Witr before sleeping, and to fast three days every month.