Al-Kāfi - The Book of Prayer

Chapter: Tashahhud after the First Two Rak‘at and After the Fourth Rak‘at and Al-Taslim َّدُ بْنُ يَحْيَى عَنْ أَحْ٠َّدٍ عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ عَنْ فَضَالَةَ بْنِ أَيُّوبَ عَنِ الْحُسَيْنِ بْنِ عُثْ٠ُسْكَانَ عَنِ الْحَلَبِيِّ قَالَ قَالَ لِي أَبُو عَبْدِ الله (عَلَيْهِ الْسَّلا٠َا ذَكَرْتَ الله بِهِ وَالنَّبِيَّ (صلّى اللهُ عَلَيْهِ وَآلِه) فَهُوَ ٠ِنَ الصَّلاَةِ وَإِنْ قُلْتَ السَّلاَ٠ُ عَلَيْنَا وَعَلَى عِبَادِ الله الصَّالِحِينَ فَقَدِ انْصَرَفْتَ.

As soon as you say the phrase, ‘I appeal before Allah to send peace on us and on the virtuous servants of Allah’, you have ended Salah (prayer).”’ صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/162))