What is the interpretation for Leave no black plume as a token of that lie thy soul hath spoken?

Answer 1

Throughout the entire stanza the narrator is telling the raven to "Get out!", and "Leave no black plume as a token" means the narrator does not even want the raven to molt a black feather as a reminder when it leaves. Then "of that lie thy soul hath spoken." refers to the lie that the narrator shall see Lenore, nevermore.

Answer 2

This line from "The Raven" by Edgar Allan Poe suggests that the speaker's soul is burdened by the lies it has told. The black plume symbolizes the guilt and falsehood weighing on the soul. It underscores the idea that one's actions and words have consequences that cannot be hidden or erased.