Egyptians were the first to say human soul is immortal

The Egyptians were the first to declare this doctrine, too, that the human soul is immortal, and each time the body perishes it enters into another animal as it is born. When it has made a circuit of all terrestrial, marine, and winged animals, it once again enters a human body as it is born. Its circuit takes three thousand years. Some Greeks have adopted this doctrine, some earlier and some later, as if it were peculiar to them. I know their names, but do not write them.