“When you are among them and lead them in prayer, let one group of them stand in prayer with you, carrying their weapons. When they have prostrated, let them move behind you, and let the other group, who have not yet prayed, come forward and pray with you, taking their precautions and carrying their weapons. The disbelievers wish for you to be heedless of your weapons and belongings, so that they may descend upon you in a single assault. But there is no blame upon you, if you are inconvenienced by rain or are ill, for laying aside your weapons, provided that you remain on your guard. Indeed, Allah has prepared a humiliating punishment for the disbelievers.” (4:102)
His saying, exalted is He: “When you are among them and lead them in prayer”: Al-Kalbi narrated from Abu Salih, from Ibn Abbas (1)