O those who believe,(l) remember Allah's favour to you, when the forces (of the infidels) came upon you, and We sent upon them a wind, and the forces (of angels) you did not see. And Allah is watchful of what you do.
(1) These verses refer to the battle of Ahzab, also known as 'the battle of Khandaq' in which different tribes of Arabia, led by the Quraish invaded upon Madinah, and the Holy Prophet ﷺ defended the city by digging a trench.