Nafi' narrated that Ibn Umar (may Allah be pleased with them) did not tie a knot in the cloth he was wearing, but rather folded both its ends and tucked them inside his izar.
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 844
Hadith Takhrijاسناده حسن اخرجه البيهقی : 81/5 ۔ وفى المعرفة السنن والآثار له (2834)۔