And when thou art among them and leadest the prayer for them, let a party of them stand up with thee, and let them take their arms. Then when they have performed their prostration, let them go to your rear, and let another party who have not prayed come forward and pray with thee, and let them take their precautions and their arms. Those who disbelieve long that you may neglect your arms and your baggage, that they may attack you with a sudden united attack. And there is no blame on you, if you are inconvenienced on account of rain or if you are sick, to put away your arms; and take your precautions. Surely Allah has prepared abasing chastisement for the disbelievers.