I'th' name of truth, are you fantastical, or that indeed which outwardly you show?
All hail, Macbeth! Hail to thee, Thane of Glamis! All hail, Macbeth! Hail to thee, Thane of Cawdor! All hail, Macbeth, that shall be king hereafter...
The three witches meet to discuss where they shall meet Macbeth
Act 1 Scene 4
We will establish our estate upon our eldest Malcolm, whom we name hereafter the Prince of Cumberland.
That is a step on which I must fall down or else o'erleap, for which in my way it lies.
After being informed about Macbeth's success against MacDonwald and the Scottish rebels by an injured general, and then of how Macbeth also defeated the traitorous Thane of Cawdor and the Norweigian Army from Ross, King Duncan gives the title of "Thane of Cawdor" to Macbeth
Act 1 Scene 5
My dearest love, Duncan comes here tonight.
O, never shall sun that morrow see!
The three witches meet Macbeth and Banquo in the woods and give Macbeth a prophecy that he will become Thane of Cawdor and the King afterwards. They similarly give one to the skeptical Banquo, saying that his sons will be kings, but he won't
Act 1 Scene 6 & 7
The air nimbly and sweetly recommends itself unto our gentles senses.
After confirming with Malcolm that the previous Thane of Cawdor has been executed, King Duncan appoints Malcolm as the "Prince of Cumberland", or, next in line to inherit Duncan's position of king. This is a problem to Macbeth.
After receiving word of Macbeth's promotion to Thane of Cawdor via letter and Duncan's eventual arrival from Macbeth, Lady Macbeth convinces Macbeth to join her in a plot of Regicide against King Duncan in order to overtake the throne.
King Duncan arrives to Macbeth's castle and notice how nice and welcoming it looks. Unbeknown to Duncan, an evil plot is stirring within.