Sahih Muslim , Hadith 412 ⓘ
'A'isha reported: The Messenger of Allah fell ill and some of his Companions came to inquire after his health. The Messenger of Allah said prayer sitting, while (his Companions) said it (behind him) standing. He (the Holy Prophet) directed them by his gesture to sit down, and they sat down (in prayer). After finishing the (prayer) he (the Holy Prophet) said: The Imam is appointed so that he should be followed, so bow down when he bows down, and rise upp when he rises up and say (prayer) sitting when he (the Imam) says (it) sitting.
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدَةُ بْنُ سُلَيْمَانَ، عَنْ هِشَامٍ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، قَالَتِ اشْتَكَى رَسُولُ اللَّهِ صلى الله عليه وسلم فَدَخَلَ عَلَيْهِ نَاسٌ مِنْ أَصْحَابِهِ يَعُودُونَهُ فَصَلَّى رَسُولُ اللَّهِ صلى الله عليه وسلم جَالِسًا فَصَلَّوْا بِصَلاَتِهِ قِيَامًا فَأَشَارَ إِلَيْهِمْ أَنِ اجْلِسُوا . فَجَلَسُوا فَلَمَّا انْصَرَفَ قَالَ " إِنَّمَا جُعِلَ الإِمَامُ لِيُؤْتَمَّ بِهِ فَإِذَا رَكَعَ فَارْكَعُوا وَإِذَا رَفَعَ فَارْفَعُوا وَإِذَا صَلَّى جَالِسًا فَصَلُّوا جُلُوسًا " .
also referenced under: Book 4, Hadith 88 (In-Book) & Book 4, Hadith 822 (USC-MSA)
This hadith is narrated with the same chain of transmitters by Hisham b. 'Urwa.
حَدَّثَنَا أَبُو الرَّبِيعِ الزَّهْرَانِيُّ، حَدَّثَنَا حَمَّادٌ يَعْنِي ابْنَ زَيْدٍ، ح وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَأَبُو كُرَيْبٍ قَالاَ حَدَّثَنَا ابْنُ نُمَيْرٍ، ح وَحَدَّثَنَا ابْنُ نُمَيْرٍ، قَالَ حَدَّثَنَا أَبِي جَمِيعًا، عَنْ هِشَامِ بْنِ عُرْوَةَ، بِهَذَا الإِسْنَادِ نَحْوَهُ .
also referenced under: Book 4, Hadith 89 (In-Book) & Book 4, Hadith 823 (USC-MSA)