КОРАН (английский перевод) - 4.102

When you are with them, and establish the prayer, let a party of them stand with you, and let them take their weapons. After making their prostrations, let them be behind you, and let another party who have not prayed come and pray with you, taking their precautions and their weapons. Those who disbelieve wish that you should be inattentive of your weapons and your baggage, so that they might swoop upon you with one assault. But there is no fault in you if you are harmed by rain, or you are sick to lay aside your weapons, but take your precautions. Allah has prepared a humiliating punishment for the unbelievers.