Al-Baqarah 2:241

حَافِظُوا عَلَى الصَّلَوَاتِ وَالصَّلَاةِ الْوُسْطَىٰ وَقُومُوا لِلَّهِ قَانِتِينَ

Maintain with care the [obligatory] prayers and [in particular] the middle prayer and stand before Allah, devoutly obedient.

فَإِنْ خِفْتُمْ فَرِجَالًا أَوْ رُكْبَانًا ۖ فَإِذَا أَمِنتُمْ فَاذْكُرُوا اللَّهَ كَمَا عَلَّمَكُم مَّا لَمْ تَكُونُوا تَعْلَمُونَ

And if you fear [an enemy, then pray] on foot or riding. But when you are secure, then remember Allah [in prayer], as He has taught you that which you did not [previously] know.

وَالَّذِينَ يُتَوَفَّوْنَ مِنكُمْ وَيَذَرُونَ أَزْوَاجًا وَصِيَّةً لِّأَزْوَاجِهِم مَّتَاعًا إِلَى الْحَوْلِ غَيْرَ إِخْرَاجٍ ۚ فَإِنْ خَرَجْنَ فَلَا جُنَاحَ عَلَيْكُمْ فِي مَا فَعَلْنَ فِي أَنفُسِهِنَّ مِن مَّعْرُوفٍ ۗ وَاللَّهُ عَزِيزٌ حَكِيمٌ

And those who are taken in death among you and leave wives behind - for their wives is a bequest: maintenance for one year without turning [them] out. But if they leave [of their own accord], then there is no blame upon you for what they do with themselves in an acceptable way. And Allah is Exalted in Might and Wise.

كَذَٰلِكَ يُبَيِّنُ اللَّهُ لَكُمْ آيَاتِهِ لَعَلَّكُمْ تَعْقِلُونَ

Thus does Allah make clear to you His verses that you might use reason.

أَلَمْ تَرَ إِلَى الَّذِينَ خَرَجُوا مِن دِيَارِهِمْ وَهُمْ أُلُوفٌ حَذَرَ الْمَوْتِ فَقَالَ لَهُمُ اللَّهُ مُوتُوا ثُمَّ أَحْيَاهُمْ ۚ إِنَّ اللَّهَ لَذُو فَضْلٍ عَلَى النَّاسِ وَلَـٰكِنَّ أَكْثَرَ النَّاسِ لَا يَشْكُرُونَ

Have you not considered those who left their homes in many thousands, fearing death? Allah said to them, "Die"; then He restored them to life. And Allah is full of bounty to the people, but most of the people do not show gratitude.

وَقَاتِلُوا فِي سَبِيلِ اللَّهِ وَاعْلَمُوا أَنَّ اللَّهَ سَمِيعٌ عَلِيمٌ

And fight in the cause of Allah and know that Allah is Hearing and Knowing.