O People who Believe! Fear Allah, and be with the truthful. 119 It was not for the people of Madina and those around them of the desert dwellers that they should lay behind the apostle of Allah, nor that they should prefer themselves before him. That is because there afflicteth them not thirst or fatigue or hunger in the way of Allah or they tread a place trodden on enraging the infidels, nor they attain an attainment from the enemy, but a good deed is thereby written down unto them. Verily Allah wasteth not the hire of the well-doers. 120 Nor do they expend any sum, small or great, nor do they traverse any valley, but it is written to their account, that God may recompense them the best of what they were doing. 121 ۞ With all this, it is not desirable that all of the believers take the field [in time of war]. From within every group in their midst, some shall refrain from going forth to war, and shall devote themselves [instead] to acquiring a deeper knowledge of the Faith and [thus be able to] teach their home-coming brethren, so that these [too] might guard themselves against evil. 122