In this scene the witches are introduced as powerful yet mysterious entities and their speech is quite arcane and have rhythmic patterns. Shakespeare ends their scene using fricative alliteration 'fair is foul, foul is fair'
The first lines that Macbeth states are 'so foul and fair a day i have not seen' this statement is paradoxical because it literally echoes the witches words . So anyway in this scene Macbeth and Banquo meet the witches after the battle and they share some prophecies with them.
They tell Macbeth that he will be the Thane of Cawdor and also say ' that shalt be king hereafter'. Yep that's right it was prophesised that Macbeth should become king however, there are a lot of questioning on the path he took to gain this power. Many suggest that perhaps his fate may have changed if he had taken a less forceful way to the throne.