I heard the Messenger of Allah ﷺ say: Straighten your rows, or Allah would create dissension amongst you. (Using translation from Muslim 436a)
سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ لَتُسَوُّنَّ صُفُوفَكُمْ فِي صَلَاتِكُمْ أَوْ لَيُخَالِفَنَّ اللهُ بَيْنَ وُجُوهِكُمْ