And what reason have you that you should not fight in the way of Allah and of the weak among the men and the women and the children, (of) those who say: Our Lord! cause us to go forth from this town, whose people are oppressors, and give us from Thee a guardian and give us from Thee a helper.

This is because your Lord would not destroy towns unjustly while their people were negligent.

And it did not beseem your Lord to have destroyed the towns tyrannously, while their people acted well.

And your Lord never destroyed the towns until He raised in their metropolis a messenger, reciting to them Our communications, and We never destroyed the towns except when their people were unjust.