As we know we r prohibited from praying any nafl salaah during the fajr time...
Below is a beautiful refutation of those innovators who say "we are only doing good deeds".
Al-Baihaqi and others reported through an authentic chain of narrators traced back to Sa‘īd Ibn Al-Musayyab that the latter saw a man doing Salāt after dawn break more than two Rak‘ahs, doing long Rukū‘ and long Sujūd. Sa‘īd ordered him not to do Nāfilah after dawn break.
The man wondered: ‘Would Allāh (swt) punish me for performing Nāfilah??’. Sa‘īd clarified: ‘No, but for violating the prophet’s (saw) Sunnah’. (1)
Indeed, Sa‘īd Ibn Al-Musayyab set a magnificently powerful way of dealing with those who practice Bid‘ah considering it a righteous act of worship and condemning Ahlus Sunnah for their rejection to their practice claiming that they reject doing Nāfilah and reciting Thikr!! Indeed, Ahlus Sunnah reject all that which contradicts the prophet’s () Sunnah. (2)
(1) Narratted by:Abdir Razzāq in “Al-Musannaf” (no. 4755), Ad-Dārimī in “As- Sunnan” (vol. 1 / p. 116), Muhammad Ibn Nasr in “Qiyāmul Lail” (p. 46) and Al- Baihaqī in “As-Sunnan Al-Kubrā” (vol. 2 / p. 466).
(2) “Irwā’ul Galīl” (vol. 2 / p. 236).