The first to speak of Earth's gravity.
Abu al-Qasim Ubayd Allah ibn Abd Allah ibn Khordadbeh said.
He died in 280 AH. In his book Al-Masalik wal-Mamalik, page 4.
Description of the Earth. He died in 280.
The Earth is spherical, like a ball, set in the sphere like the yolk in an egg.
And the air around the Earth draws it from all sides toward the sphere.
Creatures on Earth are made so the air draws what is light in their bodies.
The Earth, in turn, draws what is heavy in their bodies.
For the Earth is like the stone that draws iron, meaning a magnet.
So to say that Newton was the first to speak of gravity is incorrect.
Muslims were the first to discover Earth's gravity.
But Newton formulated the three well-known laws of gravity.