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This stress on the mortality of the Prophet - and that of all the other prophets who preceded him in time - connects, in the first instance, with the battle of Uhud and the rumour of his death, which caused many Muslims to abandon the fight and even brought some of them close to apostasy (Tabari; see also note [90] above). In its wider implication, however, the above verse re-states the fundamental Islamic doctrine that adoration is due to God alone, and that no human being - not even a prophet - may have any share in it. It was this very passage of the Qur'an which Abu Bakr, the first Caliph, recited immediately after the Prophet's death, when many faint-hearted Muslims thought that Islam itself had come to an end; but as soon as Abu Bakr added, "Behold, whoever has worshipped Muhammad may know that Muhammad has died; but whoever worships God may know that God is ever-living, and never dies" (Bukhari), all confusion was stilled. - The expression "turning about on one's heels" denotes - according to circumstances - either actual apostasy or a deliberate withdrawal from efforts in the cause of God.
This verse primarily applies to the battle of Uhud, in the course of which a cry was raised that the Messenger was slain. He had indeed been severely wounded, but Talha, Abu Bakr, and Ali were at his side, and his own unexampled bravery saved the Muslim army from a rout. This verse was recalled again by Abu Bakr when the Messenger actually died a natural death eight years later, to remind people that Allah, Whose Message he brought, lives for ever. And have need to remember this now and often for two reasons: (1) when we feel inclined to pay more than human honour to one who was the truest, the purest, and the greatest of men, and thus in a sense to compound for our forgetting the spirit of his teaching, and (2) when we feel depressed at the chances and changes of time, and forget that Allah lives and watches over us and over all His creatures now as in a history in the past and in the future.