Abdullah bin Wahb عبد الله بن وهب بن مسلم القرشي · The Book of Leading the Prayer (Al-Imamah)

"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…

It was narrated from Al'Irbad bin Sariyah that the Messenger of Allah (ﷺ) used to send Salah on the first row three times and on the second row once.

"We were with the Messenger of Allah (ﷺ) in Hunain and it rained. The caller of the Messenger of Allah (ﷺ) called out, telling us: 'Pray where you are."'

"I saw Ibn 'Umar sitting in Al-Balat when the people were praying. I said: '0 Abu 'Abdur- Rahman, why are you not praying?' He said: 'I have already prayed, and I heard the Messenger of Allah (ﷺ) say: "Do not repeat a prayer twice in one day."