The Prophet ﷺ said, "You must straighten your rows otherwise Allah will cause disagreement between you."

قَالَ النَّبِيُّ ﷺ: «لَتُسَوُّنَّ صُفُوفَكُمْ أَوْ لَيُخَالِفَنَّ اللَّهُ بَيْنَ وُجُوهِكُمْ».

The Prophet ﷺ said, "Straighten your rows, for I see you from behind my back.'

أَنَّ النَّبِيَّ ﷺ قَالَ أَقِيمُوا الصُّفُوفَ فَإِنِّي أَرَاكُمْ خَلْفَ ظَهْرِي