Is it true that the Greek term εν not to occur with verbs of motion? I understand this to be yes from the sources I read.
Moulton, James Hope., Howard, Wilbert Francis., Turner, Nigel. A Grammar of New Testament Greek: Volume 3: Syntax. New York: Bloomsbury Academic, 2000.
Robertson, A. T.. A Grammar of the Greek New Testament in the Light of Historical Research. United Kingdom: Hodder & Stoughton, 1914.