Narrated Abu Huraira:
On Fridays the Prophet used to recite Alif Lam Mim Tanzil: As-Sajdah (32) (in the first Raka) and Hal ata ‘alal-lnsani i.e. Surat ad-Dahr (76) (in the second Raka), in the Fajr prayer.
This is about the fardh prayer of Fajr. Prophet (SAW) used to recite specific Surahs in the Fajr Sunnah prayer as well. Who remembers them? :) [Find answer here.]
Imaam Bukhari brought this hadith under the chapter of Sajdah of Tilawat because Surah as-Sajdah has one of those ayaat which when Prophet (SAW) recited them, made sajdah (prostration) of tilawat (recitation of Qur’an).
إِنَّمَا يُؤْمِنُ بِآيَاتِنَا الَّذِينَ إِذَا ذُكِّرُوا بِهَا خَرُّوا سُجَّدًا وَسَبَّحُوا بِحَمْدِ رَبِّهِمْ وَهُمْ لَا يَسْتَكْبِرُونَ ۩
“Only those believe in Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), who, when they are reminded of them, fall down prostrate, and glorify the Praises of their Lord, and they are not proud.” [As-Sajdah: 15]