Čihrdād nask is one of the lost nasks of the Avesta and survives only as a summary preserved in Dēnkard 8.13.[1]
In the summary, the text is said to have been a history of mankind from the beginning down to the revelation of Zoroaster,[2] and it was an important source for later works like the Šāhnāmeh of Ferdowsi.
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