وَإِذا كُنتَ فيهِم فَأَقَمتَ لَهُمُ الصَّلاةَ فَلتَقُم طائِفَةٌ مِنهُم مَعَكَ وَليَأخُذوا أَسلِحَتَهُم فَإِذا سَجَدوا فَليَكونوا مِن وَرائِكُم وَلتَأتِ طائِفَةٌ أُخرىٰ لَم يُصَلّوا فَليُصَلّوا مَعَكَ وَليَأخُذوا حِذرَهُم وَأَسلِحَتَهُم ۗ وَدَّ الَّذينَ كَفَروا لَو تَغفُلونَ عَن أَسلِحَتِكُم وَأَمتِعَتِكُم فَيَميلونَ عَلَيكُم مَيلَةً واحِدَةً ۚ وَلا جُناحَ عَلَيكُم إِن كانَ بِكُم أَذًى مِن مَطَرٍ أَو كُنتُم مَرضىٰ أَن تَضَعوا أَسلِحَتَكُم ۖ وَخُذوا حِذرَكُم ۗ إِنَّ اللَّهَ أَعَدَّ لِلكافِرينَ عَذابًا مُهينًا

When you’re among them, leading them in prayer, let a group of them stand with you, armed. After they’ve prostrated, they should withdraw, allowing another group that has not yet prayed to come forward and pray with you. They should remain vigilant and keep their weapons ready. Those who disbelieve wish that you would neglect your weapons and your baggage, so they can launch a surprise attack. If rain or illness prevents you, there’s no blame upon you for setting aside your weapons. However, remain cautious. God has prepared a humiliating punishment for the unbelievers.