Answer:
In Act 4, Scene 1, both the First Apparition and the Second Apparition begin their prophecies by calling out, "Macbeth! Macbeth! Macbeth!" Macbeth responds to the First Apparition by thanking it for warning him against the Thane of Fife (Macduff). Macbeth responds to the Second Apparition with: "Had I three ears, I'd hear thee."