When the illness of the Messenger of Allah (ﷺ) became serious while I was with him among a group of people, Bilal called him for prayer. He said: Ask someone to lead the people in prayer. So Abdullah ibn Zam'ah went out and found that Umar was present among the people and Abu Bakr was not there. I said: Umar, get up and lead the people in prayer. So he came forward and uttered "Allah is Most Great". When the Messenger of Allah (ﷺ) heard his voice, as Umar had a loud voice, he said: Where is Abu Bakr? Allah does not allow that, and the Muslims too; Allah does not allow that, and the Muslims too. So he sent for Abu Bakr. He came after Umar had led the people in that prayer. He then led the people in prayer.
Reference: Sunan Abi Dawud 4660 In-book : Book 42, Hadith 65 English translation : Book 41, Hadith 4643
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