صحيح البخاري 4503

Narrated `Abdullah:That Al-Ash'ath entered upon him while he was eating. Al-Ash'ath said, "Today is 'Ashura." I said (to him), "Fasting had been observed (on such a day) before (the order of compulsory fasting in) Ramadan was revealed. But when (the order of fasting in) Ramadan was revealed, fasting (on 'Ashura') was given up, so come and eat

Rapporté par `Abdullah : Al-Ash'ath est venu me voir pendant que je mangeais. Al-Ash'ath a dit : « Aujourd'hui, c'est 'Ashura'. » Je lui ai dit : « On jeûnait ce jour-là avant que le jeûne obligatoire du Ramadan ne soit révélé. Mais quand le jeûne du Ramadan a été prescrit, on a abandonné le jeûne de 'Ashura', alors viens manger. »