How does amir foreshadow events to come later in the novel in the first 2 chapters?

Amir talks about his past haunting him throughout his life.

That was a long time ago, but it’s wrong what they say about the past, I’ve learned, about how you can bury it. Because the past claws its way out. Looking back now, I realise I have been peeking into that deserted alley for the last twenty-six years. ch 1