Final answer:
Shakespeare connected Macbeth to the witches through a shared prophecy, in which they foretell his future titles, piquing his deep-rooted ambitions which later steer him to his tragic fate.
Step-by-step explanation:
Shakespeare connected Macbeth to the witches through a shared prophecy. The witches inform Macbeth that he will be Thane of Cawdor and then King of Scotland. Despite Macbeth's skepticism, as he is aware that the Thane of Cawdor is still alive and well, the prophecy intrigues him. No blood pact, family relationship, or secret alliance is made between Macbeth and the witches; instead, it is the allure of the prophecy that binds their fates together. Macbeth’s own ambition and interpretation of the witches' prophetic words set him on a tragic path of ambition and ruin.