Deciphered in 19th century.  

1400 years ago nobody knew hieroglyphs.

With the final closing of pagan temples in the 5th century, knowledge of hieroglyphic writing was lost. Although attempts were made, the script remained undeciphered throughout the Middle Ages and the early modern period. The decipherment of hieroglyphic writing was finally accomplished in the 1820s by Jean-Francois Champollion, with the help of the Rosetta Stone.
Wikipedia, Egyptian hieroglyphs, 2020

When hieroglyphs were finally deciphered they found out how Egyptians mourned their Pharaoh.

A pyramid text describing the dead Pharaoh's fight for supremacy in heaven, says: The sky weeps, the stars shake, the keepers of the gods tremble and their servants flee when they behold the King rising up as spirit, as a god who lives on his fathers and possesses his mothers.
Symbols of Transformation, C.G. Jung, Volume 5 page 257

It says that "The sky weeps". This was known recently, however this was portrayed in the Quran 1400 years before it was discovered. While describing the mourning of Pharaoh:

[Quran 44:29] Neither heaven nor earth wept over them, nor were they reprieved.

"Neither heaven nor earth wept over them" here the Quran answers this claim found only in Egyptian hieroglyphs.

How could an illiterate man who lived 1400 years ago have known hieroglyphs?

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