Fasting on Friday if it coincides with Ashura
Machine translationRead the Arabic original
The questioner:
Friday will be the day of Ashura, if Allah wills. Is it permissible to fast on Friday morning on this day, given that fasting is recommended, or is it permissible?
The Shaykh:
Yes, yes. One fasts on Friday, the day before it, and the day after it. What is prohibited is to single it out on a weekday.
The questioner:
Yes.
The Shaykh:
In this case, one fasts on the Thursday before it, or fasts on the Saturday with it; there is no harm in that.
Friday will be the day of Ashura, if Allah wills. Is it permissible to fast on Friday morning on this day, given that fasting is recommended, or is it permissible?
The Shaykh:
Yes, yes. One fasts on Friday, the day before it, and the day after it. What is prohibited is to single it out on a weekday.
The questioner:
Yes.
The Shaykh:
In this case, one fasts on the Thursday before it, or fasts on the Saturday with it; there is no harm in that.
Source
ندوات الجامع الكبير مع الأسئلة - 53 — archive.org (55:39)
The Arabic text is a machine transcription of the audio recording.