Who said "We had both betrayed and been betrayed"?

This quote is attributed to Amir.

We had both betrayed and been betrayed - Amir

"We had both betrayed and been betrayed"

Amir Justice

Character in The Kite Runner

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"I became what I am today at the age of twelve, on a frigid December day in 1975."

"When you kill for the first time, you lose your innocence."

"Theft and lying were part of their world."

"I could wade into this river, let my sins drown to the bottom."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."