´It was narrated from Ibn 'Abbas that:` 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."
Hadith ReferenceSunan an-Nasa'i / The Book of The At-Tatbiq (Clasping One\'s Hands Together) / Hadith: 1098