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.'"
Reference: Sunan an-Nasa'i 1114 In-book : Book 12, Hadith 86 English translation : Vol. 2, Book 12, Hadith 1115
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