بُلُوغُ الْمَرَامِ
Bulugh al-Maram 286
The Book of Prayer
وَعَنْ أَبِي قَتَادَةَ - رضى الله عنه - قَالَ : { كَانَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -يُصَلِّي بِنَا , فَيَقْرَأُ فِي اَلظُّهْرِ وَالْعَصْرِ - فِي اَلرَّكْعَتَيْنِ اَلْأُولَيَيْنِ - بِفَاتِحَةِ اَلْكِتَابِ وَسُورَتَيْنِ , وَيُسْمِعُنَا اَلْآيَةَ أَحْيَانًا , وَيُطَوِّلُ اَلرَّكْعَةَ اَلْأُولَى , وَيَقْرَأُ فِي اَلْأُخْرَيَيْنِ بِفَاتِحَةِ اَلْكِتَابِ. } مُتَّفَقٌ عَلَيْهِ . [1]
Narrated Abu Qatadah (RA): Allah's Messenger (ﷺ) used to lead us in prayer and recite in the first two Rak'a of the Zuhr and 'Asr prayers Surat Al-Fatiha and two (other) Surah. And he would sometimes recite loud enough for us to hear the Verses. He would prolong the first Rak'a, and would recite in the last two Rak'a Surat Al-Fatiha (only). [Agreed upon].
Sunnah.com reference: Book 2, Hadith 172