Bulugh al-Maram 2 The Book of Prayer كتاب الصلاة 365

وَفِي رِوَايَةٍ لَهُ كَانَتْ خُطْبَةُ اَلنَّبِيِّ – صلى الله عليه وسلم -يَوْمَ اَلْجُمُعَةِ: { يَحْمَدُ اَللَّهَ وَيُثْنِي عَلَيْهِ, ثُمَّ يَقُولُ عَلَى إِثْرِ ذَلِكَ, وَقَدْ عَلَا صَوْتُهُ }

And in a narration of Muslim: “In the Prophet’s Khutbah on Friday: He would praise Allah and extol Him. Then, following that, he would say – and he had raised his voice…”