It is narrated from Sayyiduna al-Sa'ib bin Khallad bin Suwayd al-Ansari (may Allah be pleased with him) that he heard the Messenger of Allah (peace and blessings be upon him) say: "Jibril (peace be upon him) came to me and said: Command your companions to raise their voices in the talbiyah or in ihram." (Abdullah bin Abi Bakr said:) I do not know which of us two, I or Abd al-Malik, was uncertain about the words "ihram" and "talbiyah".
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6599