The Book of Mosques and Places of Prayer
5/26. Chapter:
It is recommended to recite statements of remembrance after the prayer, and how that is to be done
Sahih Muslim
وَحَدَّثَنَاهُ أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدَةُ بْنُ سُلَيْمَانَ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِي الزُّبَيْرِ، مَوْلًى لَهُمْ أَنَّ عَبْدَ اللَّهِ بْنَ الزُّبَيْرِ، كَانَ يُهَلِّلُ دُبُرَ كُلِّ صَلاَةٍ . بِمِثْلِ حَدِيثِ ابْنِ نُمَيْرٍ وَقَالَ فِي آخِرِهِ ثُمَّ يَقُولُ ابْنُ الزُّبَيْرِ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُهَلِّلُ بِهِنَّ دُبُرَ كُلِّ صَلاَةٍ .
Abu Zubair reported: Abdullah b Zubair used to say La ilaha il-Allah at the end of every prayer like the hadith narrated by Ibn Numair and he reported it in the end, and then reported Ibn Zubair saying: The Messenger of Allah (ﷺ) uttered La ilaha il-Allah at the end of every prayer.
Reference : Sahih Muslim 594bIn-book reference : Book 5, Hadith 181USC-MSA web (English) reference : Book 4, Hadith 1236