Believers, have fear of God and always be friends with the truthful ones. 119 It was not [proper] for the people of Madinah and those surrounding them of the bedouins that they remain behind after [the departure of] the Messenger of Allah or that they prefer themselves over his self. That is because they are not afflicted by thirst or fatigue or hunger in the cause of Allah, nor do they tread on any ground that enrages the disbelievers, nor do they inflict upon an enemy any infliction but that is registered for them as a righteous deed. Indeed, Allah does not allow to be lost the reward of the doers of good. 120 Nor do they spend anything (in Allah's Cause) - small or great - nor cross a valley, but is written to their credit, that Allah may recompense them with the best of what they used to do (i.e. Allah will reward their good deeds according to the reward of their best deeds which they did in the most perfect manner). 121 ۞ It is not possible for all believers to go out (to fight). So a part of each section (of the population) should go (to fight) in order that the others may acquire understanding of law and divinity, and warn their companions on return so that they may take heed for themselves. 122