The Holy Quran 56:70 — Surah Al-Waqi'ah

Arabic text

لَوْ نَشَآءُ جَعَلْنَـٰهُ أُجَاجًا فَلَوْلَا تَشْكُرُونَ

Translation

If We willed it, We could have made the water salty (depriving you of anything to quench your thirst), so why are you not grateful?

Tafsir (excerpt) — Tafsir Usmani

The favour of fresh water: that is, if We willed, We could turn fresh water into salty and bitter water, which you could neither drink nor use for crops. Yet [people] do not acknowledge the favour of how many reservoirs of fresh water We have placed in your hands!

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