First in Act 1 Scene 3
FIRST WITCH. All hail, Macbeth, hail to thee, Thane of
Glamis!
SECOND WITCH. All hail, Macbeth, hail to thee, Thane of
Cawdor!
THIRD WITCH. All hail, Macbeth, that shalt be King
hereafter!...
Then in Act 4 scene 1
The witches call up an apparition, an Armed Head, which tells
Macbeth "Beware Macduff," (who ends up killing Macbeth).
Then, a Bloody Child appears, that says "none of woman born /
Shall harm Macbeth," (which reassures him, because he doesn't know
Macduff had a Caesarean birth).
A Crowned Child appears next, holding a tree in his hand, who
tells him that he will not be "vanquished" until "Great Birnam Wood
to high Dunsinane Hill / Shall come against him,"