"The Prophet (ﷺ) was commanded to prostrate on seven bones and was forbidden to tuck up his hair and garment."
Sunan an-Nasa'i Book 12, Hadith 87
← Previous Hadith He saw 'Abdullah bin Al-Harith praying with his hair bound behind him. He stopped and started to undo it. When he finished he turned to Ibn 'Abbas and said: "What were you doing to my head?" He said: "I heard the Messenger of Allah (ﷺ) say: 'The likeness of this is that of one who prays with his hands tie behind his neck.'"

Sunan an-Nasa'i Book 12, Hadith 86 Next Hadith → "When he prayed Zuhr behind the Messenger of Allah (ﷺ) we would prostrate on our garments because of the heat."

Sunan an-Nasa'i Book 12, Hadith 88