Musar zu Schemot 16:29

The 24th commandment forbids Jews to leave their "place" on the Sabbath; In his ספר המצות, in which he enumerates the list of 613 commandments, Maimonides understands this commandment to refer to the prohibition of travelling or walking on the Sabbath more than one מיל or two thousand cubits (about 1.2 kilometers) beyond the city limits. He holds that this is a biblical prohibition. Maimonides later retreated from this position in his major Halachic work יד החזקה. He writes there that the Bible permits one to walk as far as 3 פרסאות, i.e. the distance of the encampment of the Jewish people in the desert. (12 times the distance mentioned earlier) Nachmanides disagrees with Maimonides on both counts, claiming that this prohibition is altogether not a biblical one, as is explained in the Babylonian Talmud. Nachmanides understands the verse 16,29 to prohibit carrying on the Sabbath from a private domain to a public domain and vice versa, i.e. the words אל יצא איש ממקומו are to be understood as אל יוציא איש ממקומו. The Talmud in Eyruvin 48 also adopts this view. Regardless of who is right, the Torah imposes restrictions of movement on the Sabbath either on man, or on his belongings, or on both.