Answer:
The purpose of the witches scene in Macbeth is to tell the reader what are the inevitable events to happen since it is destiny.
Step-by-step explanation:
The opening scene with the witches in Macbeth has shows the three witches and how they are foreseen what will happen to the character of Macbeth, then it is not his fault to do as he feels he has to, it is the fault of the destiny, it was already written for him to become a king and it was written to happen in that way.