Mishkat al-Masabih
Mishkat al-Masabih 1097
Arabic hadith text
وَعَنِ النُّعْمَانِ بْنِ بَشِيرٍ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُسَوِّي صُفُوفَنَا إِذَا قُمْنَا إِلَى الصَّلَاةِ فَإِذَا اسَتْوَيْنَا كَبَّرَ. رَوَاهُ أَبُو دَاوُد
Translation
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Al-Nuʿman ibn Bashir reported: “When we stood for prayer, the Messenger of Allah (ﷺ) used to straighten our rows. Once we were standing in order, he would say the opening takbir.” Abu Dawud transmitted it.
Notes and open questions — unreviewed
The Arabic says he would pronounce the takbir once the worshippers were standing evenly.