Which day is ‘Aashooraa’?

Al-Nawawi (may Allaah have mercy on him) said: “ ‘Aashooraa’ and Taasoo’aa’ are two elongated names [the vowels are elongated] as is stated in books on the Arabic language. Our companions said: ‘Aashooraa’ is the tenth day of Muharram and Taasoo’aa’ is the ninth day. This is our opinion, and that of the majority of scholars. This is the apparent meaning of the ahaadeeth and is what we understand from the general wording. It is also what is usually understood by scholars of the language.” (al-Majmoo’)

‘Aashooraa’ is an Islamic name that was not known at the time of Jaahiliyyah. (Kashshaaf al-Qinaa’, part 2, Sawm Muharram).

Ibn Qudaamah (may Allaah have mercy on him) said:

“ ‘Aashooraa’ is the tenth day of Muharram. This is the opinion of Sa’eed ibn al-Musayyib and al-Hasan. It was what was reported by Ibn ‘Abbaas, who said: ‘The Messenger of Allaah (peace and blessings of Allaah be upon him) commanded us to fast ‘Aashooraa’, the tenth day of Muharram.’ (Reported by al-Tirmidhi, who said, a saheeh hasan hadeeth). It was reported that Ibn ‘Abbaas said: ‘The ninth,’ and reported that the Prophet (peace and blessings of Allaah be upon him) used to fast the ninth. (Reported by Muslim). ‘Ataa’ reported that he said, ‘Fast the ninth and the tenth, and do not be like the Jews.’ If this is understood, we can say on this basis that it is mustahabb (encouraged) to fast on the ninth and the tenth, for that reason. This is what Ahmad said, and it is the opinion of Ishaaq.”