The Histories · 2.58

Moreover, it is true also that the Egyptians were the first of men who made solemn assemblies and processions and approaches to the temples, and from them the Hellenes have learnt them, and my evidence for this is that the Egyptian celebrations of these have been held from a very ancient time, whereas the Hellenic were introduced but lately.

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
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