The straightening of the rows is amongst those obligatory and good things which make your As-Salat (the prayer) a correct and perfect one.
باب إِقَامَةِ الصَّفِّ مِنْ تَمَامِ الصَّلاَةِ
5889
Sahih Bukhari
Sahih
حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا لَيْثٌ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما أَنَّهُ أَدْرَكَ عُمَرَ بْنَ الْخَطَّابِ فِي رَكْبٍ وَهْوَ يَحْلِفُ بِأَبِيهِ، فَنَادَاهُمْ رَسُولُ اللَّهِ صلى الله عليه وسلم أَلاَ إِنَّ اللَّهَ يَنْهَاكُمْ أَنْ تَحْلِفُوا بِآبَائِكُمْ، فَمَنْ كَانَ حَالِفًا فَلْيَحْلِفْ بِاللَّهِ، وَإِلاَّ فَلْيَصْمُتْ "
Narrated Ibn `Umar:
that he found `Umar bin Al-Khattab in a group of people and he was swearing by his father. So Allah's Messenger (ﷺ) called them, saying, "Verily! Allah forbids you to swear by your fathers. If one has to take an oath, he should swear by Allah or otherwise keep quiet."
Reference: Sahih al-Bukhari 6108 In-book : Book 78, Hadith 135 USC-MSA web (English) : Vol. 8, Book 73, Hadith 129 (deprecated)
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