"Messenger of Allah fell from a horse and got injured, so he led Salat sitting and we also offered Salat sitting. When he completed the Salat he said: "The Imam is appointed to be followed; when he says the Takbir then say the Takbir, when he bows, then bow, and when he raises his head, then raise your heads. When he says: "Sami' Allahu liman hamidah (Allah listens to those who praise him)" then say: "Rabbana wa lakal-hamd. (O our Lord! And all praise is Yours.)" and when he prostrates, then prostrate, and when he performs Salat sitting, then pray sitting altogether.'"  

أَنَّهُ قَالَ خَرَّ رَسُولُ اللَّهِ ﷺ عَنْ فَرَسٍ فَجُحِشَ فَصَلَّى بِنَا قَاعِدًا فَصَلَّيْنَا مَعَهُ قُعُودًا ثُمَّ انْصَرَفَ فَقَالَ إِنَّمَا الإِمَامُ أَوْ إِنَّمَا جُعِلَ الإِمَامُ لِيُؤْتَمَّ بِهِ فَإِذَا كَبَّرَ فَكَبِّرُوا وَإِذَا رَكَعَ فَارْكَعُوا وَإِذَا رَفَعَ فَارْفَعُوا وَإِذَا قَالَ سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ فَقُولُوا رَبَّنَا وَلَكَ الْحَمْدُ وَإِذَا سَجَدَ فَاسْجُدُوا وَإِذَا صَلَّى قَاعِدًا فَصَلُّوا قُعُودًا أَجْمَعُونَ قَالَ وَفِي الْبَابِ عَنْ عَائِشَةَ وَأَبِي هُرَيْرَةَ وَجَابِرٍ وَابْنِ عُمَرَ وَمُعَاوِيَةَ