It was narrated that ‘Aishah said:“The Messenger of Allah (ﷺ) used to fast ‘Ashura’, and he ordered (others) to fast it too.”
Hadith No. 1733
Sunan Ibn Majah
Gradings:
Al-Albani:
Sahih
Muhammad Fouad Abd al-Baqi:
Sahih
Shuaib Al Arnaut:
Sahih
Zubair Ali Zai:
Sahih - Bukhari And Muslim