A porter stumbles through the hallway to answer the knocking, grumbling comically about the noise and mocking whoever is on the other side of the door. He compares himself to a porter at the gates of hell and asks, "Who's there, i' th' name of Beelzebub?" (2.3.3). Macduff and Lennox enter, and Macduff complains about the porter's slow response to his knock. The porter says that he was up late carousing and rambles on humorously about the effects of alcohol, which he says provokes red noses, sleepiness, and urination. He adds that drink also "provokes and unprovokes" lechery—it inclines one to be lustful but takes away the ability to have sex (2.3.27). Macbeth enters, and Macduff asks him if the king is awake, saying that Duncan asked to see him early that morning. In short, clipped sentences, Macbeth says that Duncan is still asleep. He offers to take Macduff to the king. As Macduff enters the king's chamber, Lennox describes the storms that raged the previous night, asserting that he cannot remember anything like it in all his years. With a cry of "O horror, horror, horror!" Macduff comes running from the room, shouting that the king has been murdered (2.3.59). Macbeth and Lennox rush in to look, while Lady Macbeth appears and expresses her horror that such a deed could be done under her roof. General chaos ensues as the other nobles and their servants come streaming in. As Macbeth and Lennox emerge from the bedroom, Malcolm and Donalbain arrive on the scene. They are told that their father has been killed, most likely by his chamberlains, who were found with bloody daggers. Macbeth declares that in his rage he has killed the chamberlains.
Macduff seems suspicious of these new deaths, which Macbeth explains by saying that his fury at Duncan's death was so powerful that he could not restrain himself. Lady Macbeth suddenly faints, and both Macduff and Banquo call for someone to attend to her. Malcolm and Donalbain whisper to each other that they are not safe, since whoever killed their father will probably try to kill them next. Lady Macbeth is taken away, while Banquo and Macbeth rally the lords to meet and discuss the murder. Duncan's sons resolve to flee the court. Malcolm declares that he will go south to England, and Donalbain will hasten to Ireland.
