صَحِيحُ مُسْلِمٍ
Sahih Muslim 593 c
The Book of Mosques and Places of Prayer
It is recommended to recite statements of remembrance after the prayer, and how that is to be done
وَحَدَّثَنِي مُحَمَّدُ بْنُ حَاتِمٍ، حَدَّثَنَا مُحَمَّدُ بْنُ بَكْرٍ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، أَخْبَرَنِي عَبْدَةُ بْنُ أَبِي لُبَابَةَ، أَنَّ وَرَّادًا، مَوْلَى الْمُغِيرَةِ بْنِ شُعْبَةَ قَالَ كَتَبَ الْمُغِيرَةُ بْنُ شُعْبَةَ إِلَى مُعَاوِيَةَ - كَتَبَ ذَلِكَ الْكِتَابَ لَهُ وَرَّادٌ - إِنِّي سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ حِينَ سَلَّمَ . بِمِثْلِ حَدِيثِهِمَا . إِلاَّ قَوْلَهُ وَهُوَ عَلَى كُلِّ شَىْءٍ قَدِيرٌ . فَإِنَّهُ لَمْ يَذْكُرْ .
Warrad, the freed slave of Mughira b. Shu'ba, reported: Mughira b. Shu'ba wrote to Mu'awiya (it was Warrad who wrote this letter for him, i. e. Mughira): I heard the Messenger of Allah (ﷺ) saying:" When the salutation is pronounced." and the rest of the hadith is the same except this that he made no mention of:" He is Potent over everything."
Sahih Muslim, 593 cSahihصحيح