Surah 40. Ghafir, Ayah 46

I.e., of which they had been warned, day-in and day-out, by prophets and believers like the one spoken of in this passage.

When the Judgment really comes, it is not like an ordinary physical disaster. The Fire of Punishment is ever present-morning and evening-i.e., at all times. The sentence becomes final and there is no mitigation.