“Then returned they unto Jerusalem from the mount called Olivet, which is from Jerusalem a sabbath day's journey.”
King James Version (KJV)
1:12 A Sabbath - day's journey - The Jews generally fix this to two thousand cubits, which is not a mile.
Ac 1:12 Then returned they . . . from the mount called Olivet. See Lu 24:50. The place of ascent was near Bethany. A church now stands on the supposed place. A sabbath day's journey. "The traditions of the elders" defined the distance that might be traveled on the Sabbath. It was a little less than a mile. Bethany is nearly two miles, but Luke here is stating the distance of the Mount of Olives from the city.