وَلَقَدْ نَصَرَكُمُ اللَّـهُ بِبَدْرٍ وَأَنتُمْ أَذِلَّةٌ ۖ فَاتَّقُوا اللَّـهَ لَعَلَّكُمْ تَشْكُرُونَ ﴿١٢٣﴾ إِذْ تَقُولُ لِلْمُؤْمِنِينَ أَلَن يَكْفِيَكُمْ أَن يُمِدَّكُمْ رَبُّكُم بِثَلَاثَةِ آلَافٍ مِّنَ الْمَلَائِكَةِ مُنزَلِينَ ﴿١٢٤﴾ بَلَىٰ ۚ إِن تَصْبِرُوا وَتَتَّقُوا وَيَأْتُوكُم مِّن فَوْرِهِمْ هَـٰذَا يُمْدِدْكُمْ رَبُّكُم بِخَمْسَةِ آلَافٍ مِّنَ الْمَلَائِكَةِ مُسَوِّمِينَ ﴿١٢٥﴾ وَمَا جَعَلَهُ اللَّـهُ إِلَّا بُشْرَىٰ لَكُمْ وَلِتَطْمَئِنَّ قُلُوبُكُم بِهِ ۗ وَمَا النَّصْرُ إِلَّا مِنْ عِندِ اللَّـهِ الْعَزِيزِ الْحَكِيمِ ﴿١٢٦﴾

Wa laqad nasarakumullaahu bi-Badrin wa antum azilla; fattaqullaaha la'allakum tashkuroon. Iz taqoolu lil-mu'mineena alan yakfiyakum ay-yumiddakum Rabbukum bithalaathati aalaafim-minal-malaaa'ikati munzaleen. Balaaa; in tasbiroo wa tattaqoo wa ya'tookum min fawrihim haazaa yumdidkum Rabbukum bikhamsati aalaafim-minal-malaaa'ikati musawwimeen. Wa maa ja'alahullaahu illaa bushraa lakum wa litatmainna quloobukum bih; wa man-nasru illaa min 'indillaahil-'Azeezil-Hakeem.

(123) And already had Allah given you victory at [the battle of] Badr while you were few in number. Then fear Allah; perhaps you will be grateful. (124) [Remember] when you said to the believers, "Is it not sufficient for you that your Lord should reinforce you with three thousand angels sent down? (125) Yes, if you remain patient and conscious of Allah and the enemy come upon you [attacking] in rage, your Lord will reinforce you with five thousand angels having marks [of distinction] (126) And Allah made it not except as [a sign of] good tidings for you and to reassure your hearts thereby. And victory is not except from Allah, the Exalted in Might, the Wise -

Reference: Surah Ali-Imran 3: 123-126