Answer:
That he will be thane the thane of Cawdor
That he will be king
That Banquo's descendants eventually will become royalty
Step-by-step explanation:
The first and the second tell him:
First Witch
All hail, Macbeth, hail to thee, thane of Glamis
Second Witch
All hail, Macbeth, hail to thee, thane of Cawdor!
Macbeth was already Thane of Glamis, but the Thane of Cawdor was someone else.
But the third says something different:
Third Witch
All hail, Macbeth, thou shalt be king hereafter!"
About Banquo, they say:
Third Witch
Thou shalt get kings, though thou be none:
So all hail, Macbeth and Banquo!