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.
Meaning:-
Bedouin: an Arab of the desert.
Afflict: (of a problem or illness) cause pain or suffering to; affect or trouble.
Fatigue: sleepiness, drowsiness, extreme tiredness, typically resulting from mental or physical exertion or illness.
Tread: walk in a specified way.
Enrage: make very angry.
Inflict: impose something unwelcome on.
Righteous: (of a person or conduct) morally right or justifiable; virtuous, very good; excellent.
Doer : the person who does something.