Surah Al-Waqi'ah 56:70
لَوْ نَشَآءُ جَعَلْنَـٰهُ أُجَاجًا فَلَوْلَا تَشْكُرُونَ
If We willed, We could make it bitter, so why are you not grateful?
Translation: Saheeh International
Tafsir
If We willed We could make it bitter salty undrinkable — why then will you not give thanks?
Excerpt from Tafsir al-Jalalayn, commentary on 56:70, via Quran.com. The reader has the full commentary and 9 more tafsirs.