A Fatwa about fasting the Day of 'Ashura'
Question :
Whoever fasts the 9th and the 10th, then it becomes clear to him afterwards that he actually fasted the 8th and the 9th, what is the ruling? Does he have to make that up for?
Answer:
He does not have to make up for the fast and he receives. the complete reward, if Allâh wills, based upon his intention, because he thought that it was the 9th and the 10th according to the calendars. Therefore, he gets his reward, if Allah wills. He does not have to make up for the fast and he gets the reward of fasting the two days.
If it becomes clear to him on the 9th day that the next day will be the 10th (i.e., he thought the 9th was the 10th), should he continue fasting for three days?
It is better for him to continue fasting until he is certain that he fasted the 10th. This is what is best. If he does not fast, there is no harm, and he has missed fasting the 10th.
Source:
Ash-Shaykh Ibn Baz
Fatawa Islamiyah, Vol. 3 Page 345
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