the apparitions from the witches
"beware thane of fife" "none of woman born shall harm macbeth" "until Great Birnam wood to high Dunsinane hill"
all come from apparitions which are established as supernatural entities
The third one comes as forests can't just move around, the impossibility of it is a key element of the supernatural
macbeth relies on the supernatural prophecies to guide his actions believing he is invincible