(23) باب مَنْ يَلِي الإِمَامَ ثُمَّ الَّذِي يَلِيهِ
It was narrated that Abu Mas'ud Al-Ansiri said:
"The Messenger of Allah (ﷺ) used to gently pat our shoulders (to make sure the row was straight) at the time of prayer, and he-would say:'Keep (the rows) straight; do not differ from one another lest your hearts would be afflicted with discord. Let those who are mature and wise stand closest to me, then those who are next to them, then those who are next to them."' Abu Mas'ud said: Today, there is much disharmony among you. ,Abu 'Abdur-Rabin (An-Nasai)said: (One of the narrators) Abu Ma'mar's name is 'Abdullah bin Sakhbarah.
Reference: Sunan an-Nasa'i 807
In-book reference: Book 10, Hadith 31
English translation: Vol. 1, Book 10, Hadith 808