It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Jibril (peace be upon him) commanded me to raise my voice while calling out the talbiyah, for it is one of the rites of Hajj." All of these chains are sahih (authentic), and none of them is a cause of defect ('illah) for another, because the righteous predecessors (Salaf) would have several chains gathered for a single text, just as they are gathered with us today; and the two Shaykhs (Bukhari and Muslim) did not record this hadith.