I go, and it is done; the bell invites me.
Hear it not, Duncan; for it is a knell
That summons thee to heaven or to hell.

– William Shakespeare

Macbeth, Act 2, Scene 1. Macbeth’s soliloquy in which he talks to himself about whether to murder Duncan is interrupted by the ringing of a bell. This is Lady Macbeth’s signal that Duncan’s attendants are asleep. To Macbeth this is a “knell,” the sound of a bell rung for a death or funeral. His mind is now made up up to kill Duncan. Personification is used here when Macbeth says that the bell “invites” him.