For the source text click/tap here: Yoma 49
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Wine and spirits you shall not drink, neither you nor your descendants, when you come into the Tent of Meeting… (Leviticus 10:9)
Kohanim were prohibited from entering the Temple after drinking a revi’is of an alcoholic beverage (about 4.5 ounces, plus or minus an ounce). Additionally, a rabbi – even a non-kohein – may not render a legal decision after drinking (see Talmud Eiruvin 64a).
Our Daf quotes a braisa that a drunkard is unfit to do the avodah in the Temple. Tosfos discusses the various opinions as to which beverages will one who consumes them be liable for death, and to which will there be only a transgression. He also discusses when the service is valid, and when it is not.
This leads us to a review by Alan Nadler of Yankel’s Tavern: Jews, Liquor, & Life in the Kingdom of Poland by Glenn Dynner
and the Lubavitcher Rebbe's decree regarding liquor at fabrengens.