The Messenger of Allah (ﷺ) said: "I have been commanded to prostrate on seven, and not to tuck up my hair nor my garment: the forehead, the nose, the hands, the knees and the feet."
Sunan an-Nasa'i Book 12, Hadith 68
← Previous Hadith "My two eyes saw the traces of water and mud on the forehead and nose of the Messenger of Allah (ﷺ), from his praying Qiyam on the night of the twenty-first."

Sunan an-Nasa'i Book 12, Hadith 67 Next Hadith → The Prophet (ﷺ) said: "I have been commanded to prostrate on seven bones: on the forehead"- and he pointed with his hand- "on the nose, the hands, the knees and the ends of the feet."

Sunan an-Nasa'i Book 12, Hadith 69