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As part of the preparations Moses makes prior to receiving the Torah at Mount Sinai, he is commanded by God, "Go unto the people, and sanctify them today and tomorrow, and let them wash their garments" (Exodus 19:10 ). Three days, not two. However, Moses instructs his people thus: "Be ready against the third day; come not near a woman" (Exod. 19:15 ). This is one of three cases in the Torah...