بُلُوغُ الْمَرَامِ
Bulugh al-Maram 494
The Book of Prayer
وَعَنْهُ قَالَ: { كَانَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -يَخْرُجُ يَوْمَ اَلْفِطْرِ وَالْأَضْحَى إِلَى اَلْمُصَلَّى, وَأَوَّلُ شَيْءٍ يَبْدَأُ بِهِ اَلصَّلَاةُ, ثُمَّ يَنْصَرِفُ فَيَقُومُ مُقَابِلَ اَلنَّاسِ -وَالنَّاسُ عَلَى صُفُوفِهِمْ- فَيَعِظُهُمْ وَيَأْمُرُهُمْ } مُتَّفَقٌ عَلَيْهِ [1] .
Narrated [Abu Sa'id (RA)]: The Prophet (ﷺ) used to go out on the day of the breaking of the fast and the day of sacrifice to the place of prayer, and the first thing he would start with was the prayer. When he finished he would stand facing the people, who were seated in their rows, and he would then preach to them and command them. [Agreed upon].
Sunnah.com reference: Book 2, Hadith 421