The Women - 4:102
And when you are among them and you lead them in prayer, let a group of them be with you to guard you, and let them take their weapons with them. When those who have prayed prostrate, let them stand behind you. Then let the group who have not prayed come and pray with you, and let the group who have finished praying take their weapons and stand guard. The disbelievers hope that you will be careless with your weapons and your belongings so that they may defeat you in a sudden raid. It is permissible for you to leave your weapons because of rain or illness. But be on the alert. Allah has prepared for the disbelievers a humiliating torment.
And when you are among them and you lead them in prayer, let a group of them be with you to guard you, and let them take their weapons with them. When those who have prayed prostrate, let them stand behind you. Then let the group who have not prayed come and pray with you, and let the group who have finished praying take their weapons and stand guard. The disbelievers hope that you will be careless with your weapons and your belongings so that they may defeat you in a sudden raid. It is permissible for you to leave your weapons because of rain or illness. But be on the alert. Allah has prepared for the disbelievers a humiliating torment.