Straighten your rows, or Allah will cause dissension amongst you
عن النعمان بن بشير رضي الله عنه مرفوعاً: «لَتُسَوُّنَّ صُفُوفَكُم أو لَيُخَالِفَنَّ الله بين وُجُوهِكُم». وفي رواية: «كان رسول الله صلى الله عليه وسلم يُسَوِّي صُفُوفَنَا، حتى كَأَنَّمَا يُسَوِّي بها القِدَاح، حتَّى إِذَا رأى أَنْ قد عَقَلْنَا عَنهُ، ثم خَرَج يومًا فَقَام، حتَّى إِذَا كاد أن يُكَبِّرُ، فَرَأَى رَجُلاً بَادِيًا صَدرُهُ، فقال: عِبَادَ الله، لَتُسَوُّنَّ صُفُوفَكُم أو لَيُخَالِفَنَّ الله بين وُجُوهِكُم».
Explanation
The Prophet (may Allah's peace and blessings be upon him) emphasized that if the rows are not straightened in the prayer, Allah will cause dissension amongst the worshippers, thus making them turn their faces away from each other. This occurs when some of them step forward and leave gaps in the rows. The Prophet (may Allah's peace and blessings be upon him) used to teach his companions with his words and actions. He straightened them with his hands until he thought that they had learned.
Then in a prayer, he saw one of his companions with his chest sticking out from the row. This made him angry and he said: ''Straighten your rows, or Allah will cause dissension amongst you.''
Source
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