(4) Prayer
كتاب الصلاة
(15a) Chapter: Prostration and its Excellence - Section 1
(14) باب السجود وفضله - الفصل الأول
Mishkat al-Masabih 887 
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.)
عَنِ ابْنِ عَبَّاسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أُمِرْتُ أَنْ أَسْجُدَ عَلَى سَبْعَةِ أَعْظُمٍ عَلَى الْجَبْهَةِ وَالْيَدَيْنِ وَالرُّكْبَتَيْنِ وَأَطْرَافِ الْقَدَمَيْنِ وَلَا نَكْفِتَ الثِّيَاب وَلَا الشّعْر»
 مُتَّفق عَلَيْهِ  (الألباني)حكم :
Reference : Mishkat al-Masabih 887
In-book reference : Book 4, Hadith 311