Zevahim 89: Halakhic Conflicts -- and Fun Gemara Games
Chapter 10! With a focus on mitzvot that conflict in their timing. A new mishnah... on establishing the order of offerings, given this kind of conflict. That which is most frequent comes first. And a second mishnah! Applying "sanctity" as the determining factor of precedence. Plus other rules of thumb - including, perhaps most importantly, biblical verses that establish the order, at least of some potentially conflicting offerings.
The skinny
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