It wasnarrated from Salim, from his father:
"I heard the MessengerofAllah (ﷺ) reciting the Talbiyah when he entered Ihram withsomething applied to his head to keep the hair together.'" (ES)
English reference (ES): Vol. 4, Book 25, Hadith 3047 (ES)
Arabic reference (ES): Book 25, Hadith 3163 (ES)