Regarded by European alchemists as the foundation of their craft, the Emerald Tablet is a short, cryptic text that purportedly reveals the secret of the primordial substance and its transmutations. Even esteemed scientists such as Sir Isaac Newton have published translations of the text, which claims Hermes Trismegistus, a legendary sage or god variously identified with the Egyptian god Thoth and the Greek god Hermes, as its author. What is the oldest documentable source for this text? Discuss
Source: The Free Dictionary