The Fajr Sunnah should not be performed in the active congregational row.
The commentary prefers:
• at home when practical; or
• in a place separated from the row, such as toward the edge or entrance area, where it does not look like opposition to the congregation.
The lesson therefore avoids the overly rigid phrase 'it must always be outside the mosque.' The concern is separation from the active Fard row and preserving the congregation.
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Fajr Sunnah, Joining the Congregation, and Catching a Rak'ah
The Fajr Sunnah should not be performed in the active congregational row.
The commentary prefers:
• at home when practical; or
• in a place separated from the row, such as toward the edge or entrance area, where it does not look like opposition to the congregation.
The lesson therefore avoids the overly rigid phrase 'it must always be outside the mosque.' The concern is separation from the active Fard row and preserving the congregation.