Mukhtasar Bukhari (Abridged) 464 — Prostrating on seven bones

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet Muhammad (peace and blessings be upon him) said: "I have been commanded to prostrate on seven bones (these seven parts are): the forehead (along with the tip of the nose)." While saying this, the Messenger of Allah (peace and blessings be upon him) pointed towards his nose. "And both hands, both knees, and the toes of both feet, and it has also been commanded that we should not gather up our clothes or hair."