Almighty Allah said: And Allah has already made you victorious at Badr, when you were a weak little force. So fear Allah much abstain from all kinds of sins and evil deeds which He has forbidden and love Allah much, perform all kinds of good deeds which He has ordained that you may be grateful. (Remember) when you (Muhammad) said to the believers, "Is it not enough for you that your Lord (Allah) should help you with three thousand angels; sent down? Yes, if you hold on to patience and piety and the enemy comes rushing at you; your Lord will help you with five thousand angels having marks (of distinction). Allah made it not but as a message of good news for you and as an assurance to your hearts. And there is no victory except from Allah the All-Mighty the All-wise. That He might cut off a part of those who disbelieve, or expose them to infamy so that they retire frustrated. " Surah 3: 123-127

A Little Insight on the Battle of Badr
The remarkable circumstances which led to the victory of Badr and the results which followed from it made a deep impression on the minds of the Muslims: the angels of heaven had battled on their side against their enemies. The division of the spoils created some dissension between the Muslim warriors. For the moment, the Prophet divided it equally among all. Subsequently, a Qur'an revelation laid down a rule for future division of the spoils. According to this rule, a fifth was reserved for the public treasury for the support of the poor and indigent, while the distribution of the remaining four fifths was left to the discretion of the Chief of the State.