9:108Do not stand in it, ever. A mosque founded upon piety from the first day is worthier of your standing in it. In it are men who love to be purified. God loves those who purify themselves.

9:120It is not for the inhabitants of Medina and the Desert-Arabs around them to stay behind the Messenger of God, nor to prefer themselves to him. That is because they never suffer any thirst, nor fatigue, nor hunger in the cause of God, nor do they take one step that enrages the disbelievers, nor do they gain anything from an enemy, but it is recorded to their credit as a righteous deed. God does not waste the reward of the righteous.