Whoever Said That There is No Concern To Specify (The Day Of Fasting) Of The Month

Mu'adhah (al-'Adawiyyah) said:
I asked 'Aishah: Would the Messenger of Allah ﷺ fast three days every month ? She replied: Yes. I asked: Which days in the month he used to fast ? She replied: He did not care which days of the month he fasted.

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا عَبْدُ الْوَارِثِ، عَنْ يَزِيدَ الرِّشْكِ، عَنْ مُعَاذَةَ، قَالَتْ قُلْتُ لِعَائِشَةَ أَكَانَ رَسُولُ اللَّهِ ﷺ يَصُومُ مِنْ كُلِّ شَهْرٍ ثَلاَثَةَ أَيَّامٍ قَالَتْ نَعَمْ . قُلْتُ مِنْ أَىِّ شَهْرٍ كَانَ يَصُومُ قَالَتْ مَا كَانَ يُبَالِي مِنْ أَىِّ أَيَّامِ الشَّهْرِ كَانَ يَصُومُ .