What scene in Act 1 foreshadows ambitions and future rise station?

In Act 1 Scene 5 , Macbeth and Banquo encounter 3 witches on their heath after having just won King Duncan 's favor for bravely and honorably winning a major Scottish battle . In addition to hailing Macbeth as Thane of Glamis and Cawdor ( titles he does n't currently hold ) .