Jami at-Tirmidhi 3477 (sahih, al-Albani)

سَمِعَ النَّبِيُّ صلى الله عليه وسلم رَجُلاً يَدْعُو فِي صَلاَتِهِ فَلَمْ يُصَلِّ عَلَى النَّبِيِّ صلى الله عليه وسلم فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ عَجِلَ هَذَا ‏"‏ ‏.‏ ثُمَّ دَعَاهُ فَقَالَ لَهُ أَوْ لِغَيْرِهِ ‏"‏ إِذَا صَلَّى أَحَدُكُمْ فَلْيَبْدَأْ بِتَحْمِيدِ اللَّهِ وَالثَّنَاءِ عَلَيْهِ ثُمَّ لِيُصَلِّ عَلَى النَّبِيِّ صلى الله عليه وسلم ثُمَّ لِيَدْعُ بَعْدُ بِمَا شَاءَ ‏"‏ ‏.‏

“Amr bin Malik Al-Janbi narrated that he heard Fadalah bin `Ubaid saying:“The Prophet ﷺ heard a man supplicating in his Salat but he did not send Salat upon the Prophet ﷺ, so the Prophet ﷺ said: ‘This one has rushed.’ Then he called him and said to him, or to someone other than him: ‘When one of you performs Salat, then let him begin by expressing gratitude to Allah and praising Him. Then, let him send Salat upon the Prophet ﷺ, then let him supplicate after that, whatever he wishes.’””