Narrated Ibn 'Abbas: The Prophet was ordered (by Allah) to prostrate on seven parts and not to tuck up the clothes or hair (while praying). Those parts are: the forehead (along with the tip of nose), both hands, both knees, and (toes of) both feet.
— Sahih Bukhari, Volume 1, Book 12: Characteristics of Prayer, Hadith #773
Narrated Ibn 'Abbas: The Prophet was ordered (by Allah) to prostrate on seven parts and not to tuck up the clothes or hair (while praying). Those parts are: the forehead (along with the tip of nose), both hands, both knees, and (toes of) both feet.
This hadith is from the book of Characteristics of Prayer in Sahih Bukhari, compiled by Imam al-Bukhari. It is hadith number 773 in book 12 of volume 1.
This hadith is referenced in the following topics: How to Pray.
