حَدَّثَنَا مُسَدَّدٌ حَدَّثَنَا حُمَيْدُ بْنُ الْأَسْوَدِ حَدَّثَنَا مُصْعَبُ بْنُ ثَابِتٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَنَسٍ بِهَذَا الْحَدِيثِ قَالَ إِنَّ رَسُولَ اللَّهِ صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ کَانَ إِذَا قَامَ إِلَی الصَّلَاةِ أَخَذَهُ بِيَمِينِهِ ثُمَّ الْتَفَتَ فَقَالَ اعْتَدِلُوا سَوُّوا صُفُوفَکُمْ ثُمَّ أَخَذَهُ بِيَسَارِهِ فَقَالَ اعْتَدِلُوا سَوُّوا صُفُوفَکُمْ
سنن ابودوٗد · Hadith 670
This tradition has also ben transmitted by Anas through a different chain of transmitters. This version goes: when the Messenger of Allah ﷺ stood for prayer, he took it (the stick) in his right hand and turning (to the right side) said; keep straight and straighten your rows. He then took it in his left hand and said; keep straight and straighten your rows.
Sanad
حَدَّثَنَا مُسَدَّدٌ حَدَّثَنَا حُمَيْدُ بْنُ الْأَسْوَدِ حَدَّثَنَا مُصْعَبُ بْنُ ثَابِتٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَنَسٍ