If the 4 emphasized Sunnah rak'ahs before Zuhr were missed because the Fard congregation began:
• perform the Fard with the congregation;
• then make up those 4 Sunnah rak'ahs within the Zuhr time;
• the preferred fatwa position stated in the commentary places them before the regular 2 Sunnah rak'ahs after Zuhr.
The commentary records an alternate ordering as well, so the course identifies the preferred position rather than claiming there was never any juristic difference.
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Fajr Sunnah, Joining the Congregation, and Catching a Rak'ah
If the 4 emphasized Sunnah rak'ahs before Zuhr were missed because the Fard congregation began:
• perform the Fard with the congregation;
• then make up those 4 Sunnah rak'ahs within the Zuhr time;
• the preferred fatwa position stated in the commentary places them before the regular 2 Sunnah rak'ahs after Zuhr.
The commentary records an alternate ordering as well, so the course identifies the preferred position rather than claiming there was never any juristic difference.