Doubt, in Cases involving Biblical/Rabbinic Law

Rabbinic Mitzvot

Rabbinic Prohibitions [Gezeirot]

Rabbinic Enactments [Takkanot]

Dealing with doubt in cases involving impurity

Principles of Adjudication

Biblical possibilites vs. Rabbinic Certainties: Rosh HaShanah 34b
Whether a possibility [Safek] can remove a person/item from a known, certain, status [Chazakah/Vaday]: Eruvin 35b-36a; Pesachim 9a-10b; Niddah 15b-16a
Being lenient in choosing between interpretations of a Rabbinic issue/law: Eruvin 5b, 45b-46b; Taanit 27a

Tithing: Rosh HaShanah 14b
Searching for Leaven before Pesach: Pesachim 9b-10a
Impurity of Liquids: Pesachim 16a
Doubt in cases involving ritual immersion: Eruvin 35b-36a
For a Blessing pre-Consumption: Gilyon HaShas Berachot 12a
Terumah nowadays: Pesachim 9b-10a
Impurity of Liquids: Pesachim 16a
An egg that might have been laid on Shabbat or Yom Tov: Beitzah 3b-4a
An egg that might have been laid by a mortally wounded chicken: Beitzah 3b
Paying the difference in value when Redeeming sanctified items: Temurah 27b
Doubt in cases involving a meal employed to extend the limit of travel [Techum] on Shabbat/Yom Tov: Eruvin 35a-36b, 46b, 52b


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