Tafsir of Al-Waqi'ah 56:70

لو نشاء جعلناه أجاجا

(If We willed, We verily could make it salty;) meaning salty, sour, undrinkable and unfit for growing plants,

فلوﻻ تشكرون

why then do you not give thanks? `why do you not appreciate the favor Allah does for you by sending down the rain fresh, ready to consume,'

هو الذى أنزل من السماء ماء لكم منه شراب ومنه شجر فيه تسيمون

ينبت لكم به الزرع والزيتون والنخيل واﻻعنب ومن كل الثمرت إن فى ذلك ﻻية لقوم يتفكرون

From it you drink and from it (grows) the vegetation on which you send your cattle to pasture. With it He causes to grow for you the crops, the olives, the date palms, the grapes, and every kind of fruit. Verily, in this is indeed an evident proof and a manifest sign for people who give thought. (16:10-11) Allah said,

أفرأيتم النار التي تورون