Through the death of Mohammed everything became uncertain. The combination under one leadership of such a heterogeneous mass as that of his Arabs would have been unthinkable a few years before. It became quite natural, though, as soon as the Prophet's mouth was recognized as the organ of Allah's voice. Must this monarchy be continued after Allah's mouthpiece had ceased to exist? It was not at all certain. The force of circumstances and the energy of some of Mohammed's counsellors soon led to the necessary decisions. A number of the notables of the community succeeded in forcing upon the hesitating or unwilling members the acceptance of the monarchy as a permanent institution. There must be a khalîf, a deputy of the Prophet in all his functions (except that of messenger of God), who would be ruler and judge and leader of public worship, but above all _amîr al-mu'minîn_, "Commander of the Faithful," in the struggle both against the apostate Arabs and against the hostile tribes on the northern border. But for the military success of the first khalifs Islâm would never have become a universal religion. Every exertion was made to keep the troops of the Faithful complete. The leaders followed only Mohammed's example when they represented fighting for Allah's cause as the most enviable occupation. The duty of military service was constantly impressed upon the Moslims; the lust of booty and the desire for martyrdom, to which the Qorân assigned the highest reward, were excited to the utmost. At a later period, it became necessary in the interests of order to temper the result of this excitement by traditions in which those of the Faithful who died in the exercise of a peaceful, honest profession were declared to be witnesses to the Faith as well as those who were slain in battle against the enemies of God,--traditions in which the real and greater holy war was described as the struggle against evil passions. The necessity of such a mitigating reaction, the spirit in which the chapters on holy war of Mohammedan lawbooks are conceived, and the galvanizing power which down to our own day is contained in a call to arms in the name of Allah, all this shows that in the beginning of Islâm the love of battle had been instigated at the expense of everything else.