Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:2-1660bNāfiʿ
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السيوطي:٢-١٦٦٠b

"عَنْ نَافِعٍ أنَّ عُمَرَ كَانَ يَأمُرُ بِتَسْوِيَةِ الصُّفُوفِ، فَإِذَا جَاءُوا فَأَخْبَرُوهُ أَنْ قَدِ اسْتَوَتْ، كَبَّرَ".  

مالك، [عب] عبد الرازق [ق] البيهقى في السنن

See similar narrations below:

Collected by Mālik
malik:9-51Yaḥyá > Mālik > Nāfiʿ

Yahya related to me from Malik from Nafi that Umar ibn al-Khattab used to order the rows to be straightened, and when they had come to him and told him that the rows were straight he would say the takbir.  

مالك:٩-٥١حَدَّثَنِي يَحْيَى عَنْ مَالِكٍ عَنْ نَافِعٍ

أَنَّ عُمَرَ بْنَ الْخَطَّابِ كَانَ يَأْمُرُ بِتَسْوِيَةِ الصُّفُوفِ فَإِذَا جَاءُوهُ فَأَخْبَرُوهُ أَنْ قَدِ اسْتَوَتْ كَبَّرَ