Note 1 at Ac 1:12: "Sabbath day's journey" refers to the distance that the scribes and Pharisees had decided was permissible to walk on a Sabbath day. They had interpreted Ex 16:29 as meaning that travel on the Sabbath day was restricted. Therefore, they had calculated the exact number of steps that a good Jew could walk, and it became a unit of measure equal to a little less than one of our miles.