(44) باب أَعْضَاءِ السُّجُودِ وَالنَّهْىِ عَنْ كَفِّ الشَّعْرِ، وَالثَّوْبِ، وَعَقْصِ الرَّأْسِ، فِي الصَّلاَة
It was narrated from Al-'Abbas bin 'Abdul Muttalib that he heard the Messenger of Allah (ﷺ) say:
"When a person prostates, he prostates on seven part of the body: His face, his hands, his knees and his feet." (RU)
Reference (RU): Sahih Muslim 491 (RU)
In-book reference (RU): Book 4, Hadith 262 (RU)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 995 (RU)