It was narrated that Abu Mas’ud said: “The Messenger of Allah (ﷺ) said: ‘No prayer is acceptable in which a man does not settle his spine when bowing and when prostrating.’”
SahihSahihSahihBook 5 · Hadith 68
سنن ابن ماجه
It was narrated that Abu Mas’ud said: “The Messenger of Allah (ﷺ) said: ‘No prayer is acceptable in which a man does not settle his spine when bowing and when prostrating.’”