"The Messenger of Allah used to command us to fast the three days with the shining bright nights (Al-Ayam Al-Bid), the thirteenth, fourteenth and fifteenth."
كَانَ رَسُولُ اللَّهِ ﷺ يَأْمُرُنَا بِصَوْمِ أَيَّامِ اللَّيَالِي الْغُرِّ الْبِيضِ ثَلاَثَ عَشْرَةَ وَأَرْبَعَ عَشْرَةَ وَخَمْسَ عَشْرَةَ