What is the minimum volume of food that constitutes a kezayit (olive-sized portion) for which a blessing or halakhic obligation applies?
Synopsis
The measurement of a kezayit is disputed. The Mechaber follows the view that it equals half an egg, while the Rambam holds it is one-third of an egg. The proper conduct varies by context: for Torah obligations like matzah, one should follow the stricter measure; for rabbinic obligations and blessings, the more lenient measure may suffice under certain conditions.
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