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Surah 8. Al-Anfal
Ayah 7 - 8
7 وَإِذْ يَعِدُكُمُ ٱللَّهُ إِحْدَى ٱلطَّآئِفَتَيْنِ أَنَّهَا لَكُمْ وَتَوَدُّونَ أَنَّ غَيْرَ ذَاتِ ٱلشَّوْكَةِ تَكُونُ لَكُمْ وَيُرِيدُ ٱللَّهُ أَن يُحِقَّ ٱلْحَقَّ بِكَلِمَـٰتِهِۦ وَيَقْطَعَ دَابِرَ ٱلْكَـٰفِرِينَ
8 لِيُحِقَّ ٱلْحَقَّ وَيُبْطِلَ ٱلْبَـٰطِلَ وَلَوْ كَرِهَ ٱلْمُجْرِمُونَ
[7-8] Remember the occasion when Allah was holding out to you the promise that one of the two hosts5 would fall to you: you wished the weaker host should fall to you:6 but Allah willed to prove by His words the Truth to be truth and to cut across the roots of the disbelievers so that the Truth should come out as truth and falsehood should be proved to be falsehood, even though the evil-doers did not like it.7
5That is, the trade caravan, or the army of the Quraish.
6That is, the trade caravan, that was accompanied by a guard band numbering between thirty and forty.
7This makes it clear that the march of the army of the Quraish towards AI-Madinah amounted to a challenge from the system of 'ignorance' to the system of Islam, as stated in the Introduction to this Surah. Allah willed that the Muslims should accept that challenge and fight a decisive battle for the survival of Islam in Arabia. If the Muslims had not marched out boldly on that occasion, they would have lost all chances of their survival. Their bold march and victory at Badr in the very first battle crushed the power of the Quraish and created such favorable conditions for Islam that after this it went on defeating the system of "ignorance".