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 No. 1709
Sunan Ibn Majah
Gradings:
Al-Albani:
Sahih
Muhammad Fouad Abd al-Baqi:
Sahih
Shuaib Al Arnaut:
Sahih
Zubair Ali Zai:
Sahih Muslim