The porter jokes about being the gatekeeper of hell and responds to knocking
He jokes about different professions represented by the knocking
The porter mentions a two-faced con man who can deceive both sides
Macduff and Lennox arrive, questioning the porter about staying up late and drinking
The porter jokes about the effects of drinking, causing red nose, sleepiness, and sexual desire
Macbeth is woken up by the knocking and greets Macduff and Lennox
Macduff informs Macbeth of a terrible act of destruction, hinting at the murder of King Duncan