Sunan Abi Dawud 665
سنن أبي داود#665SahihNarrated An-Nu'man ibn Bashir: The Messenger of Allah (ﷺ) used to straighten our rows when we stood up to pray, and when we were straight, he said: Allah is most great (takbir)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 2:275