Who said "I was a coward. A yellow coward"?

This quote is attributed to Amir.

I was a coward. A yellow coward - Amir

"I was a coward. A yellow coward"

Amir

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."