And when thou art amidst them and hast set up the prayer for them , then let a party of them stand with thee and let them retain their arms ; then when they have prostrated themselves , let them go behind you , and let anot her party who have not yet prayed , come and pray with thee ; and let them also take their caution and their arms . Pain would those who disbelieve that ye neglected your arms and your baggage , so that they might swoop down upon you at one swoop .