When you are with them, and lead the Contact Prayer (Salat) for them, let some of you stand guard; let them hold their weapons, and let them stand behind you as you prostrate. Then, let the other group that has not prayed take their turn praying with you, while the others stand guard and hold their weapons. Those who disbelieved wish to see you neglect your weapons and your equipment, in order to attack you once and for all. You commit no error, if you are hampered by rain or injury, by putting down your weapons, so long as you remain alert. GOD has prepared for the disbelievers a shameful retribution.