Surah Al-Furqan (The Criterion), Verse 37

وَقَوْمَ نُوْحٍ لَّمَّا كَذَّبُوا الرُّسُلَ اَغْرَقْنٰهُمْ وَجَعَلْنٰهُمْ لِلنَّاسِ اٰیَةً وَاَعْتَدْنَا لِلظّٰلِمِیْنَ عَذَابًا اَلِیْمًا ۟

Wa qawma Noohin lammaa kazzabur Rusula aghraqnaahum wa ja'alnaahum linnaasi Aayatanw wa a'tadnaa lizzaalimeena 'azaaban aleemaa

“And the people of Noah,- when they rejected the messengers, We drowned them, and We made them as a Sign for mankind; and We have prepared for (all) wrong-doers a grievous Penalty;-”

Quran 25:37 (Yusuf Ali Translation)