(14) باب اسْتِحْبَابِ رَكْعَتَيْ سُنَّةِ الْفَجْرِ وَالْحَثِّ عَلَيْهِمَا وَتَخْفِيفِهِمَا وَالْمُحَافَظَةِ عَلَيْهِمَا وَبَيَانِ مَا يُسْتَحَبُّ أَنْ يُقْرَأَ فِيهِمَا
Abu Huraira reported that the Messenger of Allah (ﷺ) recited in the two (supererogatory) rak'ahs of the dawn (prayer):
" Say: O unbelievers," (Qur'an, cix.) and" Say: Allah is one" (cxii.).
Reference: Sahih Muslim 726
In-book reference: Book 6, Hadith 120
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1575