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דרך שלשת ימים. פשט דקרא נלך במדבר ונזבחה וא"ת זבחו הנה פן יפגענו כלומר הן נזבח את תועבת מצרים וגו': דרך שלשת ימים, “a distance of three days’ walk.” The plain meaning of the verse is that Moses requested to take the people to the desert in order there to offer sacrifices to their G–d. In the event that Pharaoh would ask: “why can you not offer these sacrifices right here?” Moses anticipated this question, and he added that unless we do it in the desert we will be subject to severe punishment by our G–d. (Compare Exodus 8,22 for further elaboration)