Wa iz qaalat ummatum minhum lima ta'izoona qaw manil laahu muhlikuhum aw mu'azzibuhum 'azaaban shadeedan qaaloo ma'ziratan ilaa Rabbikum wa la'allahum tattaqoon
And when a party of them said: Why do you admonish a with a severe chastisement? They said: To be free from blame before your Lord, and that haply they may guard (against evil).