Ibn ‘Abbas reported God’s Messenger as saying, “I have been commanded to prostrate myself on seven bones:the forehead, the hands, 1 the knees, and the extremities of the feet, 2 and not to fold back the clothing or the hair.” 1. i.e. the palms. 2. i.e. the toes. (Bukhari and Muslim.)
Hadith Referenceمشكوة المصابيح / كتاب الصلاة / 887
Hadith Gradingالألبانی:مُتَّفق عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (812) و مسلم (230 / 490)»