Answer (by Mushafiq Sultan)

Salaam.

In the opinion of Mr. Ghamidi, the sacred day for Bani Israel was Friday, which they later on changed to Saturday. The Almighty has also alluded to this in the Qur'an that the Sabbath was only enjoined on those who differed about it (See 16:124). Several hadith narratives of the Prophet (sws) also allude to this fact that Friday was the original sacred congregational day for the progeny of Abraham (pbuh).

Regards,