The Messenger of Allah (may peace he upon him) used to touch our shoulders in prayer and say: Keep straight, don't be irregular, for there would be dissension in your hearts. Let those of you who are sedate and prudent be near me, then those who are next to them, then those who are next to them. Abu Mas'ud said: Now-a-days there is much dissension amongst you. (Using translation from Muslim 432a)  

كَانَ رَسُولُ اللَّهِ ﷺ يَمْسَحُ مَنَاكِبَنَا فِي الصَّلَاةِ وَيَقُولُ «لَا تَخْتَلِفُوا فَتَخْتَلِفَ قُلُوبُكُمْ لِيَلِيَنِّي مِنْكُمْ أُولُو الْأَحْلَامِ وَالنُّهَى ثُمَّ الَّذِينَ يَلُونَهُمْ ثُمَّ الَّذِينَ يَلُونَهُمْ» قَالَ أَبُو مَسْعُودٍ فَأَنْتُمُ الْيَوْمَ أَشَدُّ اخْتِلَافًا  

“The Messenger of Allah ﷺ used to gently pat our shoulders (to make sure the row was straight) at the time of prayer, saying: ‘Keep (the rows) straight, do not differ from one another lest your hearts should suffer from discord. Let those who are forbearing and wise stand closest to me, then those who are next to them, then those who are next to them.’” (Using translation from Ibn Mājah 976)   

قَالَ رَسُولُ اللَّهِ ﷺ «لِيَلِيَنِّي مِنْكُمْ أُولُو الْأَحْلَامِ وَالنُّهَى ثُمَّ الَّذِينَ يَلُونَهُمْ ثُمَّ الَّذِينَ يَلُونَهُمْ وَلَا تَخْتَلِفُوا فَتَخْتَلِفَ قُلُوبُكُمْ وَإِيَّاكُمْ وَهَوْشَاتِ الْأَسْوَاقِ» قَالَ الْهَوْشَاتُ الِاجْتِمَاعُ