The Messenger of Allah (ﷺ) said: “I have been commanded to prostrate on seven, but not to tuck up my hair or my garment.”
Sunan Ibn Majah Book 5, Hadith 82
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Sunan Ibn Majah Book 5, Hadith 81 Next Hadith → “When a person prostrates, seven parts of his body prostrate with him: His face, his two hands, his two knees, and his two feet.”

Sunan Ibn Majah Book 5, Hadith 83