Edward Sell, The Faith of Islam
“ A common one is: "I testify that there is no deity but God, I testify to His unity and that He has no partner; I testify that Muhammad is His servant and His messenger." The shorter form is: "There is no deity but God and Muhammad is the apostle of God." The power contained in this latter confession is extraordinary. It embodies the very spirit of Islám. "It has led everywhere the march of its armies, it has rung for twelve centuries in the morning air from its minarets, it has been passed from lip to lip, as no other word has ever been passed, by thousands of millions of the human race." ”
