Fasting the White Days if They Coincide with the Days of Tashriq

The questioner:
The questioner said: If it is the custom of the Muslim community to fast three days of every month, does he fast on the thirteenth, fourteenth, and fifteenth?

The Shaykh:
If he is.

The questioner:
If the Muslims have a custom of fasting on certain days of every month.

The Shaykh:
Yes.

The questioner:
So the first fast is on the thirteenth of the month, the fourteenth, and the fifteenth.

The Shaykh:
The fourteenth does not fall within the days of Hajj. Nor does the fifteenth? Only the thirteenth is the thirteenth, so he does not fast on the thirteenth? But he fasts on the fourteenth and the fifteenth, yes, because they are outside the days of Tashriq.