It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that I heard the Prophet (peace and blessings of Allah be upon him) saying: "The example of one who prays with his hair tied in a knot on his head is like that of a person who prays with his hands tied behind his back."
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 2903
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد ضعيف لضعف ابن لهيعة، وقد توبع