سورة At-Taubah ( The Repentance ) - الآية 120

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.