´It was narrated that Abu Mas'ud said:` "The Messenger of Allah (ﷺ) said: 'The prayer is not valid if a man does not bring his backbone to rest while bowing and prostrating.'"
Hadith Referenceسنن نسائي / باب سجود القرآن / 1028
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده صحيح