Mark 14:28. But after I have risen, I will go ahead of you into Galilee."
That was Jesus' instructions to the disciples. The disciples lack of faith made them slow to act on these words; they did not leave for Galilee until Jesus had repeatedly appeared to them in Jerusalem. Any first year seminary student with a half decent study Bible can figure this one out.
I doubt he still could with more than "a half decent study Bible".
Why does Luke (contrarily to Matthew 26:32) omit the Markan saying about Galilee and has Jesus insist instead that the disciples stay in Jerusalem (Luke 24:33,47,52; Acts 1:4: "he ordered them not to leave Jerusalem") -- which was so obviously necessary for his Pentecost story?
(This is a complimentary answer.)