What is the ruling on performing supererogatory prayers (nafilah) after the obligatory dawn prayer (Fajr), and what is your opinion on someone who says, "My prayer is a charity for whoever did not pray Fajr in congregation"?

The prohibition of performing supererogatory prayers after the Fajr prayer until the sun rises, and after the Asr prayer until the sun sets, is established. This is a point of contention among scholars. The majority of them hold that performing supererogatory prayers during these times is disliked (makruh). Imam Al-Shafi'i and a group of scholars are of the opinion that supererogatory prayers which have a specific reason (sabab) are permissible. Dawud and the Zahiri school permit them absolutely, claiming abrogation (naskh), while others maintain an absolute prohibition. As for donating the reward of prayer to another person, scholars differ on this issue. According to the Hanbalis and Hanafis, the reward reaches the person for whom it is intended, whereas the Malikis and Shafi'is hold that it does not.