Where does Misha say it is his duty?

In "The Kite Runner" by Khaled Hosseini, Misha expresses that it is his duty to protect those who cannot protect themselves, particularly in the context of his relationship with his friends and family. He feels a strong sense of responsibility to stand up for the vulnerable and ensure their safety, reflecting his moral values and the impact of his upbringing. This sense of duty drives his actions throughout the narrative.