يَصُومُ يَوْمَ عَاشُورَاءَ وَتِسْعًا مِنْ ذِي الْحِجَّةِ وَثَلاَثَةَ أَيَّامٍ مِنَ الشَّهْرِ أَوَّلَ اثْنَيْنِ مِنَ الشَّهْرِ وَخَمِيسَيْنِ .
It was narrated from Hunaidah bin Khalid that his wife said: "One of the wives of the Prophet said: "The Prophet used to fast on the day of 'Ashura, nine days of Dhul-Hijjah and three days each month: The first Monday of the month, and two Thursday."