Explanation of the divisions of the Mufassal and the position of Surat al-Shams within it

The questioner:
May Allah reward you. Honorable Shaykh, this questioner says: Was the Prophet’s (peace and blessings be upon him) recitation of Surat al-Shams in the Fajr prayer during residence or during travel?

The Shaykh:
Surat al-Shams and its dawn; I do not know, or does it turn away?

The questioner:
It is possible .

The Shaykh:
Al-Shams is from the middle of the Mufassal, from the short surahs of the Mufassal. Yes.

The questioner:
May Allah reward you. This questioner says: Your statement confused me.

The Shaykh:
From 'Amma to the end is from the middle, and what comes after 'Amma is from the short ones. Yes. Or the opposite: the long surahs of the Mufassal. The Mufassal consists of long, medium, and short surahs. The long ones are from Qaf to 'Amma; these are the long ones. The medium ones are from An-Nazi'at to Ad-Duha; these are the medium ones. The short ones are from Ad-Duha to An-Nas; these are the short ones.