Fair is foul, and Foul is Fair. Hover through the filthy air
Planning to kill King Duncan
You can kill Duncan tonight, and pretend the servants did it
The death of king Duncan
In the first act we see the three witches gathering in a dark storm. When they say Fair is Foul and Foul is Fair, it is clear that they mean evil, but in those very words they can tell both MacBeth and the audience what will happen next
Malcom and Donaldbain
O Horror, Horror, Horror
Let's not stay here with them, it's easy for a liar to pretend. I'm going to England, let's get on our horses
In the first act Lady Macbeth tells Macbeth that the king has had a good relationship with Macbeth since he became the new Thane of Cawdor. Macbeth refuses to kill Duncan but Lady Macbeth was still able to convince him and that when they would kill Duncan they would blame it on the servants.
MacBeth goes in to kill Duncan but notices a bloody dagger already sitting there. Lady Macbeth helps him plant the bloody daggers on Duncan's drunken guards. Then proceeds to go kill Duncan and blames it on the servants
Murder of Banquo
After hearing about their father's death Malcom and Donaldbain fear a conspiracy and flee unnoticed. They are afraid that they will be next so they feel the best option is to get out and go as far away as they can.
In act 3 at Forres, Macbeth and his wife welcome the thanes of Scotland to the banquet. Macbeth invites Banquo and Fleance but Banquo says that he was planning to go for a ride on his horse with his son but that they will be back for the feast.
Fail not our feast
My lord I will not
Later in act 3 Horses are heard approaching and Banquo and Fleance enter. The murderers attack Banquo but Fleance manages to escape. Macbeth is surpised to hear the news and becomes paranoid.