Hadith 674
Abu Masud reported the Messenger of Allah ﷺ as saying: let those of your who are sedate and prudent be near me, then those who are next to them, then those who are next to them.
Hadith 801
Abu Mamar said: We asked Khabbab: Did the Messenger of Allah ﷺ recit (the Quran) in the noon and afternoon prayers? He replied: Yes. We then asked: How did you know this? He said: By the shaking of his beard, may peace be upon him.
Hadith 855
Narrated Abu Masud al-Badri: The Prophet ﷺ said: A man's prayer does not avail him unless he keeps his back steady when bowing and prostrating.