Abu Mas'ud Al-Ansari [Al-Badri] narrated that : Allah's Messenger said: "The Salat is not acceptable if a man is not at rest - meaning his back - while bowing and prostrating"
SahihSahihHasan SahihBook 2 · Hadith 117
جامع الترمذي
Abu Mas'ud Al-Ansari [Al-Badri] narrated that : Allah's Messenger said: "The Salat is not acceptable if a man is not at rest - meaning his back - while bowing and prostrating"