The Prophet ﷺ was commanded to prostrate on seven bones and not to tuck up his hair or his clothes.
حدثنا قتيبة حدثنا حماد بن زيد عن عمرو بن دينار عن طاوس
أمر النبي ﷺ أن يسجد على سبعة أعظم ولا يكف شعره ولا ثيابه
Agreed upon [by Bukhari and Muslim]. Bukhari reported it in the Book of Adhan, Chapter: One should not gather up his hair, no. 815, and Muslim, no. 490, from the hadith of Hammad bin Zayd, with the same wording.