William Muir,
The Caliphate: Its Rise, Decline and Fall…
“ Recognising the sacred words to bear a meaning that had never struck him before, 'Omar was speechless. "My limbs trembled," he would say when speaking of that memorable hour, "and I knew of a certainty that Mohammad was dead indeed."Men of Medina meet to elect a chief.The assembly in the court of the Mosque had now quieted down, when a messenger ran up breathless with a report that the men of Medina had assembled to choose a ruler from amongst themselves. The moment was critical. The unity of the Faith was at stake. A divided power would fall to pieces, and all might be lost. ”
