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
1579
Sahih Bukhari
Sahih
حَدَّثَنِي إِسْحَاقُ الْوَاسِطِيُّ، حَدَّثَنَا خَالِدٌ، عَنْ خَالِدٍ الْحَذَّاءِ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم طَافَ بِالْبَيْتِ، وَهْوَ عَلَى بَعِيرٍ، كُلَّمَا أَتَى عَلَى الرُّكْنِ أَشَارَ إِلَيْهِ بِشَىْءٍ فِي يَدِهِ وَكَبَّرَ.
Narrated Ibn `Abbas:
Allah's Messenger (ﷺ) performed Tawaf (of the Ka`ba) ending a camel (at that time the Prophet (ﷺ) had foot injury). Whenever he came to the Corner (having the Black Stone) he would point out towards it with a thing in his hand and say, "Allahu-Akbar."
Reference: Sahih al-Bukhari 1632 In-book : Book 25, Hadith 115 USC-MSA web (English) : Vol. 2, Book 26, Hadith 697 (deprecated)
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