Surat Al Anfal: (41-42)

{وَاعْلَمُواْ أَنَّمَا غَنِمْتُم مِّن شَيْءٍ فَأَنَّ لِلّهِ خُمُسَهُ وَلِلرَّسُولِ وَلِذِي الْقُرْبَى وَالْيَتَامَى وَالْمَسَاكِينِ وَابْنِ السَّبِيلِ إِن كُنتُمْ آمَنتُمْ بِاللّهِ وَمَا أَنزَلْنَا عَلَى عَبْدِنَا يَوْمَ الْفُرْقَانِ يَوْمَ الْتَقَى الْجَمْعَانِ وَاللّهُ عَلَى كُلِّ شَيْءٍ قَدِيرٌ} [الأنفال : 41]

41- O Muslims, let it be known that the money of disbelievers which you gained from war must be divided into five parts: One-fifth is dedicated to Allah and His Messenger [i.e., that should be spent of the poor, the needy, the wayfarers and the Prophet's relatives]. The share of the Prophet after his death should placed in the Muslim treasury house or the general utilities of Muslims.

As for the fourth-fifth, they must be distributed to worriers who participated in war.

So, obey the command of Allah and be convinced with His Ordinance if you are truly believers in Allah, in His Last Day, and in the Ayahs, angels and victory which we sent to Muhammad during the battle of Badr. Indeed, Allah is capable of everything and part of it is what you had seen in the battle of Badr.

{إِذْ أَنتُم بِالْعُدْوَةِ الدُّنْيَا وَهُم بِالْعُدْوَةِ الْقُصْوَى وَالرَّكْبُ أَسْفَلَ مِنكُمْ وَلَوْ تَوَاعَدتَّمْ لاَخْتَلَفْتُمْ فِي الْمِيعَادِ وَلَـكِن لِّيَقْضِيَ اللّهُ أَمْراً كَانَ مَفْعُولاً لِّيَهْلِكَ مَنْ هَلَكَ عَن بَيِّنَةٍ وَيَحْيَى مَنْ حَيَّ عَن بَيِّنَةٍ وَإِنَّ اللّهَ لَسَمِيعٌ عَلِيمٌ} [الأنفال : 42]

42- O Muslims, remember that day when you were at the nearest valley to Medina and polytheists were at the farthest side of the valley and the caravan of Abu Sufyan and his troops were below you near to the coast. If you and polytheists made an agreement to fight in that place, you would not meet in that time and that place because you came out to raid on that caravan and they came out to prevent you of that. You were few in number, therefore you did not wish to encounter them, but Allah destined that war would take place to grant victory for Muslims, defeat the enemy, cherish His Religion, and raise the word of the truth so as to make them die after they had seen the proofs of their Lord or live while seeing those proofs, and the matter would be decisive.

Or so that the disbelief and faith would be based on clear proofs because the battle of Badr was a clear evidence for those who ponder and take a heed.

Verily, Allah is All-Hearing to your invocations and All-Knowing with your sincerity and intentions, and knew that your deserved victory over your enemy.