New answers tagged fast-days
Tzom is the word used most often in Biblical Hebrew to mean "fast" (such as in Isaiah in Esther); the word Taanis doesn't appear until the Book of Ezra, which was later (about two hundred years after Isaiah). Hence, Tzom Gedalya is called Tzom because it is mentioned in Tanakh (Zechariah 8:19), while Taanis Esther uses the more modern term Taanis because it ...
The statement is made in what appears to be an addendum to the 6th letter printed at the end of Ateres Tzvi (the Zitishover's commentary on the Zohar). He makes two similar statements equating drinking on Purim to fasting for 6 days. He does not source the idea but compares it to the fasting of Mar b'rei d'Ravina (of which I am unfamiliar).
Sefer Segulas Yisrael 80:3 is the source you are looking for.
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