Final answer:
In Shakespeare's play, "Worthy Cawdor! All-hail hereafter" is spoken by Lady Macbeth to her husband, Macbeth, acknowledging his new title and future rise in power.
Step-by-step explanation:
The phrase "Worthy Cawdor! All-hail hereafter" is spoken by Lady Macbeth in William Shakespeare's play, Macbeth. This line is directed at Macbeth himself after he has been informed that he will be given the title of Thane of Cawdor. The witches' prophecy has foreshadowed this event, and upon Macbeth's return, Lady Macbeth greets him with this phrase, acknowledging both his current honor and the greater power that is implied to come in the future.