They ask you ˹O Prophet˺ to hasten on the evil (Allah’s scourge) rather than the good, although there have been instances of exemplary punishments before them. In fact your Lord is the Lord of Forgiveness to the people, notwithstanding their wrongdoing; and it is also the fact that your Lord is stern in retribution.
Meaning:-
Scourge: to cause great suffering or punishment.
exemplary :serving as a warning, (of a punishment) serving as a warning or deterrent.
Stern: firm, strict, or uncompromising
Retribution: the distribution of rewards and punishments in a future life