Ibn Abbas reported that when the Messenger of Allah ﷺ fasted on the day of Ashura and commanded that it should he observed as a fast, they (his Companions) said to him: Messenger of Allah, it is a day which the Jews and Christians hold in high esteem. Thereupon the Messenger of Allah ﷺ said: When the next year comes, God willing, we would observe fast on the 9th But the Messenger of Allah ﷺ died before the advent of the next year.