[Machine] From the Prophet ﷺ that he used to come to the back of the row to the last position and even out the chests and shoulders of the people, and he would say, "Do not differ, lest your hearts differ. Verily, Allah and His angels pray upon the first ranks."  

عَنِ النَّبِيِّ ﷺ أَنَّهُ كَانَ يَأْتِي نَاحِيَةَ الصَّفِّ إِلَى النَّاحِيَةِ الْقُصْوَى يُسَوِّي مِنْ صُدُورِ الْقَوْمِ وَمَنَاكِبِهِمْ وَيَقُولُ «لَا تَخْتَلِفُوا فَتَخْتَلِفَ قُلُوبُكُمْ إِنَّ اللَّهَ وَمَلَائِكَتَهُ يُصَلُّونَ عَلَى الصُّفُوفِ الْأُوَلِ»