Sayyidah Umm Salamah (may Allah be pleased with her) states: The Prophet (peace and blessings be upon him) forbade a man to pray while he has tied his hair into a knot.
Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2469