Sahih Muslim 648 g
Abu'l-'Aliyat al-Bara' reported:
I said to 'Abdullah b. Samit: We say our Jumu'a prayer behind those rulers who defer the prayer. He ('Abdullah b. Samit), struck. my thigh that I felt pain and said: I asked Abu Dharr about it, he struck my thigh and said: I asked the Messenger of Allah (ﷺ) about it. Upon this he said: Observe prayer at its prescribed time, and treat prayer along with them (along with those Imams who deter prayer) as Nafl. 'Abdullah said: It was narrated to me that the Messenger of Allah (ﷺ) struck the thigh of Abd Dharr.
وَحَدَّثَنِي أَبُو غَسَّانَ الْمِسْمَعِيُّ، حَدَّثَنَا مُعَاذٌ، - وَهْوَ ابْنُ هِشَامٍ - حَدَّثَنِي أَبِي، عَنْ مَطَرٍ، عَنْ أَبِي الْعَالِيَةِ الْبَرَّاءِ، قَالَ قُلْتُ لِعَبْدِ اللَّهِ بْنِ الصَّامِتِ نُصَلِّي يَوْمَ الْجُمُعَةِ خَلْفَ أُمَرَاءَ فَيُؤَخِّرُونَ الصَّلاَةَ - قَالَ - فَضَرَبَ فَخِذِي ضَرْبَةً أَوْجَعَتْنِي وَقَالَ سَأَلْتُ أَبَا ذَرٍّ عَنْ ذَلِكَ فَضَرَبَ فَخِذِي وَقَالَ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنْ ذَلِكَ فَقَالَ ‏
"‏ صَلُّوا الصَّلاَةَ لِوَقْتِهَا وَاجْعَلُوا صَلاَتَكُمْ مَعَهُمْ نَافِلَةً ‏"‏ ‏.‏ قَالَ وَقَالَ عَبْدُ اللَّهِ ذُكِرَ لِي أَنَّ نَبِيَّ اللَّهِ صلى الله عليه وسلم ضَرَبَ فَخِذَ أَبِي ذَرٍّ ‏.‏