Then after grief , He sent down a peaceful slumber ( calm ) , which engulfed a group among you – and another party kept fearing for their own lives , thinking wrongfully of Allah – like the thoughts of ignorance ; they say , “ Do we have any authority in this matter ? ” Say ( O dear Prophet Mohammed peace and – blessings be upon him ) , “ All authority lies only with Allah ” ; they hide in their hearts what they do not reveal to you ; they say , “ Had we any control , we would not have been slain here ” ; say , “ Even if you had been in your houses , those destined to be slain would have come forth to their places of slaying ; and in order that Allah may test what is in your breasts and reveal whatever is in your hearts ” ; and Allah knows well what lies within the hearts .