Do the two supererogatory Rak`ahs (units of Prayer) before Fajr (Dawn) Prayer suffice for Tahiyyat-ul-Masjid (two-unit Prayer to salute the mosque)? Is it wrong that a worshiper performs both Tahiyyat-ul-Masjid and the two supererogatory Rak`ahs of Fajr Prayer?
The two supererogatory Rak`ahs offered before Fajr Prayer will count as sufficient to fulfill both: the Sunnah Salah of Fajr and Tahiyyat-ul-Masjid. This is the preferred course of action. However, if a worshiper offers Tahiyyat-ul-Masjid first, then the two supererogatory Rak`ahs before Fajr Prayer, there is nothing wrong in that.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.