What is the practice and halakhic status of Kol Nidrei on the night of Yom Kippur?
Synopsis
Kol Nidrei is an ancient formula recited before nightfall on Yom Kippur. There is a dispute about whether it refers to past vows (Geonim/early versions) or future vows (Rabbenu Tam). Most Ashkenazim follow Rabbenu Tam. The Aruch HaShulchan holds it is not legally effective and functions only as prayer.
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