Daily Talk
The Rambam rules that dough being worked can sit all day and never become chametz. The moment you lift your hand, a clock starts running. Why is rest, not time, the thing that leavens?
The Dough Only Rises When You Stop
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About This Talk
Chapter 5 of Chametz u'Matzah defines what can actually become chametz: only five grains, only with water, and only when the dough is left at rest. Kneading discipline, water that slept overnight, the walk of a mil, and the laws of purging vessels all turn on one idea: leaven is what happens when effort stops.