AVOID DISSENSION H 1108 "Keep your rows straight during prayers, if you do not Allah will create dissension among you. The Messenger of Allah, praise and peace be upon him, insisted that we keep our rows straight to the extent that they were as straight as arrows. He continued to emphasize this till he felt sure we had recognized its importance. One day he came into the Mosque to lead the prayer and was about to pronounce the opening takbirs (Allahu Akbar) when he noticed the chest of one of the worshipers protruding out of the line, he said, 'Worshipers of Allah, keep your rows straight or else Allah will create dissension among you.'" R 1108 Bukhari and Muslim with a chain up to Nu'man son of Bashir who related that he heard the Messenger of Allah, praise and peace be upon him, say this.
1089- وعن النعمان بن بشير رضي الله عنهما ، قَالَ : سمعت رَسُول اللهِ صلى الله عليه وآله وسلم ، يقول : "لَتُسَوُّنَّ صُفُوفَكُمْ ، أوْ لَيُخَالِفَنَّ اللَّهُ بَيْنَ وُجُوهِكُمْ" متفقٌ عَلَيهِ . وفي رواية لمسلم : أنَّ رَسُول اللهِ صلى الله عليه وآله وسلم كَانَ يُسَوِّي صُفُوفَنَا ، حَتَّى كَأنَّمَا يُسَوِّي بِهَا القِدَاحَ حَتَّى رَأى أنَّا قَدْ عَقَلْنَا عَنْهُ ، ثُمَّ خَرَجَ يَوماً فَقَامَ حَتَّى كَادَ يُكَبِّرُ ، فَرَأى رَجُلاً بَادِياً صَدْرُهُ مِنَ الصَّفِّ ، فَقَالَ : "عِبَادَ اللهِ ، لتُسَوُّنَّ صُفُوفَكُمْ ، أو لَيُخَالِفَنَّ اللهُ بَيْنَ وُجُوهِكُمْ" .