Sahih Muslim Book 4, Hadith 135
This hadith is narrated by Ibn Uyaina with the same chain of transmitters.
The Messenger of Allah (may peace he upon him) used to touch our shoulders in prayer and say: Keep straight, don't be irregular, for there would be dissension in your hearts. Let those of you who are sedate and prudent be near me, then those who are next to them, then those who are next to them. Abu Mas'ud said: Now-a-days there is much dissension amongst you.
The Messenger of Allah (ﷺ) said: Let those who are sedate and prudent be near me, then those who are next to them (saying it tliree tinies), and beware of the tumult of the markets.