1400 years ago people drank fast when they were thirsty, but nobody knew which animal drank the fastest. Today we know that thirsty camels can drink 200 L (53 US gal) of water in three minutes.
Camels have a series of physiological adaptations that allow them to withstand long periods of time without any external source of water. The dromedary camel can drink as seldom as once every 10 days even under very hot conditions, and can lose up to 30% of its body mass due to dehydration. Unlike other mammals, camels' red blood cells are oval rather than circular in shape. This facilitates the flow of red blood cells during dehydration and makes them better at withstanding high osmotic variation without rupturing when drinking large amounts of water: a 600 kg (1,300 lb) camel can drink 200 L (53 US gal) of water in three minutes.
Wikipedia, Camel, 2021
Camels are the fastest drinkers. This was only known recently, however this was portrayed in the Quran 1400 years before it was discovered. Thirsty people in Hell will drink like camels.
Thirsty people will drink like thirsty camels. Today we know that thirsty camels are the fastest drinkers.
How could an illiterate man who lived 1400 years ago have known the fastest drinker?
The Quran (Koran, the book of Islam) contains scientific knowledge that could not have been known 1400 years ago. It ranges from basic arithmetics to the most advanced topics in astrophysics. You are invited to go through those miracles and judge for yourself.
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