Foreshadowing

A sign, a saying, or an image that anticipates, sometimes only for the rereader, something that will happen later in the work.

In Dom Casmurro

at the first suspicion on my part, everything between us would be dissolved

Capitu declares that the first suspicion would undo the courtship, and the novel fulfills the warning in Chapter CXXXVIII, when Bentinho's suspicion leads to the separation.

Chapters LXVI to LXXVII: Escobar's Visit and the Horseman, Capitu, in the narrator's voice

In life there are such odd resemblances.

Chapters LXXVIII to XCII: Secret for Secret and the Death of Manduca, Gurgel, Sancha's Father

Some of her gestures were already becoming more repeated, like Escobar's hand and foot movements; lately she had even picked up the way he turned his head when speaking, and the way he let it drop when laughing

Chapters CXIII to CXXIV: Sancha's Hand and the Drowning, the narrator