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The Memphite Theology
When
Inscribed c. 700 BCE, claiming much older origin
Where it survives
The Shabaka Stone, now in the British Museum
What it is
Creation by Ptah conceiving the world in his heart and speaking it into existence, an intellectual account of creation with few parallels that early.
Read it with this in mind
The stone claims to copy a worm-eaten ancient papyrus. That claim served the political purpose of ranking Memphis above Heliopolis, and how much is genuinely old is disputed.
Myths attested here
Other sources