the Messenger of Allah used to fast three days of each month: Monday at the beginning of the month, the following Thursday, then the Thursday after that.
أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَصُومُ ثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ يَوْمَ الاِثْنَيْنِ مِنْ أَوَّلِ الشَّهْرِ وَالْخَمِيسَ الَّذِي يَلِيهِ ثُمَّ الْخَمِيسَ الَّذِي يَلِيهِ
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