ذِكْرُ الْأَمْرِ بِصِيَامِ أَيَّامِ الْبِيضِ
"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." (Using translation from Nasāʾī 2432)
«أَمَرَنَا رَسُولُ اللَّهِ ﷺ بِصَوْمِ ثَلَاثَ عَشْرَةَ وَأَرْبَعَ عَشْرَةَ وَخَمْسَ عَشْرَةَ»