Why was mac Beth jealous of banquo?

Macbeth becomes jealous of Banquo because he feels threatened by the witches' prophecy that Banquo's descendants will be kings, leading Macbeth to fear that Banquo's lineage will jeopardize his own power and position as king. Macbeth's increasing paranoia and ambition drive him to eliminate Banquo and his son in order to secure his hold on the throne.