Tyler R

Question: Who is Luke talking about when he covers up his hand and says that he has a promise to keep to an old friend? Who is the old friend?

Tyler R

Answer: Yoda. When he was departing for Cloud City to save his friends in the previous film, he promised Yoda that he would return to Dagobah to complete his training.

Phaneron

OK. But I thought he was talking about the holeish thing in his hand since he covered it up when he said it. I must have misunderstood it.

The hole in Luke's robotic hand reminds him that he got that robotic hand in the first place because he lost his duel with Darth Vader at Cloud City - a confrontation Yoda warned him he was not ready for.

TonyPH