´It was narrated from Mu’adhah Al-‘Adawiyyah that ‘Aishah said:` “The Messenger of Allah (ﷺ) used to fast three days of each month.” I said: “Which were they?” She said: “He did not care which days they were.”
Hadith ReferenceSunan Ibn Majah / The Book of Fasting / Hadith: 1709
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم