“Farewell," they cried, "Wherever you fare till your eyries receive you at the journey's end!" That is the polite thing to say among eagles.
"May the wind under your wings bear you where the sun sails and the moon walks," answered Gandalf, who knew the correct reply.”
― J.R.R. Tolkien, The Annotated Hobbit: The Hobbit, Or, There and Back Again