Allah (swt) in the previous verse spoke about the weapons -patience and fear Allah-  by which the man faces life and its difficulties in addition to the machinations that were carried out by the Jews and other enemies of the nation and the enemies of religion, Allah (swt) wanted to chronicle in faith the Battle of Badr, which was a separation between truth and falsehood, which (swt) called the Battle of Al-Furqan, but He (swt) did not mention the victory directly, rather He mention before worth the setback that occurred in the Battle of Uhud. That is to see how the Noble Qur’an treats all aspects. Allah (swt) wanted to talk about the remarkable victory of Badr, which had its reasons, namely patience, piety and commitment. He (swt) as well wanted to show what was the reason for the setback of the Battle of Uhud; for this world is based on causes, and any violation of the causal orders that the Prophet (saws) stated, will be a cause of setback (disobeying the causal commands, not the faith orders). So If we do not commit to the laws of Allah (swt) in the universe, we will not achieve victory; that is because the elements of victory have reasons, as the military orders that we also have to abide to.

وَإِذْ غَدَوْتَ مِنْ أَهْلِكَ تُبَوِّىءُ الْمُؤْمِنِينَ And [remember] when you, [O Muhammad], left your family in the morning to post the believers}: He (saws) was in the house of Aisha (may Allah be pleased with her).

Al bara’ bin Azib (May allah be pleased with him) said:

“On the day of the battle of Uhud the Apostle of Allah (saws) appointed ‘Abd Allah bin Jubair commander of the archers who were fifty (in number). He (saws) said:

“If you see that the birds are snatching at us, do not move from this place of yours until I send for you and if you see that we defeated the people (the enemy) and trod them down, do not move until I send for you.”

Allah then defeated them. He (narrator) said: “I swear by Allaah, I saw women ascending the mountain. The companions of ‘Abd Allaah bin Jubair said: “Booty, O People, booty! Your companions vanquished, for what are you waiting?” ‘Abd Allaah bin Jubair said: “Have you forgotten what the Apostle of Allaah (saws) had told you?” They said: “We swear by Allah. We shall come to the people and get the booty. So they came to them. Their faces were turned and they came defeated.”[1]

So the Prophet (saws) put them in their places at the top of the mountain of Uhud in order to protect their backs, then violating this command led to the setback of Uhud, since when the archers saw victory and descended from the mountain, in this case they violated a causal order of the Prophet (saws) and this what led to the setback.

وَاللّهُ سَمِيعٌ عَلِيمٌ {and Allah is Hearing and Knowing}: Allah (swt) hears the commands of the Prophet (saws) to the believers not to leave their places, and He (swt) knows what they did.

[1] Sahih al-Bukhari, Book of   Fighting for the cause of Allah, Chapter of the abominable dispute and difference in war and the punishment of whom disobey the authority, Hadith No. 2874.