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Lit., "when you were destroying them": a reference to the opening stages of the battle of Uhud. Regarding the promise alluded to, see verses {124-125} of this surah.
Lit., "you disagreed with one another regarding the [Prophet's] command" - an allusion to the abandonment of their post by most of the archers at the moment when it seemed that victory had been won (see note [90] above).
Out of the fifty Muslim archers less than ten remained at their post, and were killed by Khalid's cavalry. It is to them, as well as the few Companions who went on fighting after the bulk of the Muslims had fled, that the second part of the above sentence refers.
Lit., "He turned you away from them".
The archers disputed whether to keep their positions after the initial victory. Eventually, most of them decided to go in pursuit of the spoils of war, disobeying the Prophet’s direct orders not to leave their position no matter what happened. Defeat became inevitable.
The order was: not to leave the post and strictly to maintain discipline. Uhud was in the beginning a victory for the Muslims. Many of the enemy were slain, and they were retiring when a part of the Muslims, against orders, ran in pursuit, attracted by the prospects of booty. See note to iii. 121.
The disobedience seemed at first pleasant: they were chasing the enemy, and there was the prospect of booty. But when the gap was noticed by the enemy, they turned the flank round the hill and nearly overwhelmed the Muslims. Had it not been for Allah's grace, and the firmness of their Prophet and his immediate Companions, they would have been finished.