Surah Al-Inshiqaq 84:24
فَبَشِّرْهُم بِعَذَابٍ أَلِيمٍ
So give them tidings of a painful punishment,
Translation: Saheeh International
Tafsir
So give them good tidings inform them of a painful chastisement
Excerpt from Tafsir al-Jalalayn, commentary on 84:24, via Quran.com. The reader has the full commentary and 9 more tafsirs.