The Holy Quran, Surat Al-i'Imran - آل عمران

إِن يَنصُرْكُمُ اللّهُ فَلاَ غَالِبَ لَكُمْ وَإِن يَخْذُلْكُمْ فَمَن ذَا الَّذِي يَنصُرُكُم مِّن بَعْدِهِ وَعَلَى اللّهِ فَلْيَتَوَكِّلِ الْمُؤْمِنُونَ

If Allah is your helper none can overcome you, and if He withdraw His help from you, who is there who can help you? In Allah let believers put their trust.

وَلَئِن مُّتُّمْ أَوْ قُتِلْتُمْ لإِلَى الله تُحْشَرُونَ

What though ye be slain or die, when unto Allah ye are gathered?

يَا أَيُّهَا الَّذِينَ آمَنُواْ لاَ تَكُونُواْ كَالَّذِينَ كَفَرُواْ وَقَالُواْ لإِخْوَانِهِمْ إِذَا ضَرَبُواْ فِي الأَرْضِ أَوْ كَانُواْ غُزًّى لَّوْ كَانُواْ عِندَنَا مَا مَاتُواْ وَمَا قُتِلُواْ لِيَجْعَلَ اللّهُ ذَلِكَ حَسْرَةً فِي قُلُوبِهِمْ وَاللّهُ يُحْيِـي وَيُمِيتُ وَاللّهُ بِمَا تَعْمَلُونَ بَصِيرٌ

O ye who believe! Be not as those who disbelieved and said of their brethren who went abroad in the land or were fighting in the field: If they had been (here) with us they would not have died or been killed; that Allah may make it anguish in their hearts. Allah giveth life and causeth death; and Allah is Seer of what ye do.

ثُمَّ أَنزَلَ عَلَيْكُم مِّن بَعْدِ الْغَمِّ أَمَنَةً نُّعَاساً يَغْشَى طَآئِفَةً مِّنكُمْ وَطَآئِفَةٌ قَدْ أَهَمَّتْهُمْ أَنفُسُهُمْ يَظُنُّونَ بِاللّهِ غَيْرَ الْحَقِّ ظَنَّ الْجَاهِلِيَّةِ يَقُولُونَ هَل لَّنَا مِنَ الأَمْرِ مِن شَيْءٍ قُلْ إِنَّ الأَمْرَ كُلَّهُ لِلَّهِ يُخْفُونَ فِي أَنفُسِهِم مَّا لاَ يُبْدُونَ لَكَ يَقُولُونَ لَوْ كَانَ لَنَا مِنَ الأَمْرِ شَيْءٌ مَّا قُتِلْنَا هَاهُنَا قُل لَّوْ كُنتُمْ فِي بُيُوتِكُمْ لَبَرَزَ الَّذِينَ كُتِبَ عَلَيْهِمُ الْقَتْلُ إِلَى مَضَاجِعِهِمْ وَلِيَبْتَلِيَ اللّهُ مَا فِي صُدُورِكُمْ وَلِيُمَحَّصَ مَا فِي قُلُوبِكُمْ وَاللّهُ عَلِيمٌ بِذَاتِ الصُّدُورِ

Then, after grief, He sent clown security for you. As slumber did it overcome a party of you, while (the other) party, who were anxious on their own account, thought wrongly of Allah, the thought of ignorance. They said: Have we any part in the cause? Say (O Muhammad): The cause belongeth wholly to Allah. They hide within themselves (a thought) which they reveal not unto thee, saying: Had we had any part in the cause we should not have been slain here. Say: Even though ye had been in your houses, those appointed to be slain would have gone forth to the places where they were to lie. (All this hath been) in order that Allah might try what is in your breasts and prove what is in your hearts. Allah is Aware of what is hidden in the breasts (of men).

وَلَقَدْ صَدَقَكُمُ اللّهُ وَعْدَهُ إِذْ تَحُسُّونَهُم بِإِذْنِهِ حَتَّى إِذَا فَشِلْتُمْ وَتَنَازَعْتُمْ فِي الأَمْرِ وَعَصَيْتُم مِّن بَعْدِ مَا أَرَاكُم مَّا تُحِبُّونَ مِنكُم مَّن يُرِيدُ الدُّنْيَا وَمِنكُم مَّن يُرِيدُ الآخِرَةَ ثُمَّ صَرَفَكُمْ عَنْهُمْ لِيَبْتَلِيَكُمْ وَلَقَدْ عَفَا عَنكُمْ وَاللّهُ ذُو فَضْلٍ عَلَى الْمُؤْمِنِينَ

Allah verily made good His promise unto you when ye routed them by His leave, until (the moment) when your courage failed you, and ye disagreed about the order and ye disobeyed, after He had shown you that for which ye long. Some of you desired the world, and some of you desired the Hereafter. Therefore He made you flee from them, that He might try you. Yet now He hath forgiven you. Allah is a Lord of Kindness to believers.

بَلِ اللّهُ مَوْلاَكُمْ وَهُوَ خَيْرُ النَّاصِرِينَ

But Allah is your Protector, and He is the best of helpers.