Surah 3. Aal-Imran, Ayah 165

Many of the followers of the Prophet had been convinced that, whatever the circumstances, God would grant them victory on account of their faith alone. The bitter experience at Uhud came as a shock to them; and so the Qur'an reminds them that this calamity was a consequence of their own doings.

I.e., at the battle of Badr, in the year 2 H.

If Uhud was a reverse to the Muslims, they had inflicted a reverse twice as great on the Makkans at Badr. This reverse was not without Allah's permission, for He wanted to test and purify the faith of those who followed Islam, and to show them that they must strive and do all in their power to deserve Allah's help. If they disobeyed orders and neglected discipline, they must attribute the disaster to themselves and not to Allah.