When you (Prophet) are with the faithful, conducting their prayers, let one party of them rise up to pray with you, armed with their weapons. After making their prostrations, let them withdraw to the rear and then let another party who have not prayed come forward and pray with you; and let these also be on their guard, armed with their weapons. It would much please the unbelievers if you neglected your arms and your baggage, so that they could swoop upon you with one assault. But it is no offence for you to lay aside your arms when overtaken by heavy rain or stricken with an illness, although you must be always on your guard. God has prepared a shameful punishment for the unbelievers.