"Fair is foul and foul is fair, / Hover through the fog and filthy air" (1.1. 12-13).
Act 1, Scene 2
"No more that Thane of Cawdor shall deceive / Our bosom interest; Go, pronounce his present / death, / And with his former title greet Macbeth" (1.2. 73-76).
Act 1, Scene 3
"All hail, Macbeth, that shalt be king hereafter!" (1.3. 53)
"All hail, Macbeth! Hail to thee, Thane of Cawdor!" (1.3. 52).
"We will establish our estate upon / Our eldest, Malcolm, whom we name hereafter / The Prince of Cumberland..." (1.4. 43-45).
Three witches, the Weird Sisters, contrive a plan to manipulate Macbeth. They state that after the battle that Macbeth is fighting in has finished, they will meet him in a field.
Act 1, Scene 4
A bloody Captain, fresh from battle, tells Duncan how bravely Macbeth and Banquo fought in battle and how they led their army to victory. After the Captain leaves, Ross enters and tells how the Thane of Cawdor has committed treason. King Duncan orders the execution of the traitor and instructs Ross and Angus to give the title of Thane of Cawdor to Macbeth.
Act 1, Scene 5
Macbeth and Banquo stumble upon The Witches chanting. The Witches predict that Banquo will father a long line of Kings and Macbeth will become Thane of Cawdor and eventually, King. Once Macbeth finds out he is now Thane of Cawdor, he starts to believe The Witches may be right about him becoming King. So, he starts to wonder if he should kill Duncan to become King.
Act 1, Scenes 6-7
“I am settled and bend up / Each corporal agent to this terrible feat. / Away, and mock the time with fairest show. / False face must hide what the false heart doth know” (1.7. 92-96).
King Duncan recognizes Banquo and Macbeth's bravery. Then, Duncan names his son, Malcom, Prince of Cumberland. Macbeth realizes that he now must kill both Malcolm and Duncan if he wants to become King.
"The Prince of Cumberland! That is a step / On which I must fall down o o'erleap / For in my way it lies..." (1.4. 55-57)
Lady Macbeth reads a letter that Macbeth has sent her, describing the events involving the witches and what they predicted. She wants Macbeth to become King as he was promised, but fears that he won't be heartless enough to kill Duncan in order to become King. Later, a servant enters and tells her that King Duncan will be staying in her home tonight. When Macbeth returns home, she tells him that she has a plan to ensure King Duncan won't leave their home alive.
“Glamis thou art, and Cawdor, and shalt be / What thou art promised. Yet do I fear thy nature; / It is too full o' th' milk of human kindness / To catch the nearest way” (1.5. 15-18).
King Duncan praises Lady Macbeth for her hospitality and hostess skills. Macbeth doesn't want to go through with the murder because Duncan has honored him and Macbeth feels the murder of a good man is wrong. Lady Macbeth then questions his manhood and makes him feel like a coward who doesn't go after what he wants. This forces Macbeth to decide that he will in fact go through with the plan to murder Duncan.