It wasnarrated from Zaid bin Khalid Al-Juhani that the Messenger ofAllah(ﷺ) said:
"Jibril came to me and said: 'O Muhammad! Tell yourCompanions to raise their voices when reciting the Talbiyah, for itisone of the symbols of Hajj.'" (IT)
English reference (IT): Vol. 4, Book 25, Hadith 2923 (IT)
Arabic reference (IT): Book 25, Hadith 3035 (IT)