Kite runner: Why is this moment so important in Amir's journey? ?

Question

On Amir's trip back to Afghanistan, he stays at the home of his driver, Farid. Upon leaving he remarks: "Earlier that morning, when I was certain no one was looking, I did something I had done twenty-six years earlier: I planted a fistful of crumpled money under the mattress." Why is this moment so important in Amir's journey?

Answer 1

Years early Amir put I think it was his new watch or something of value under Hassans mattress which was one of the reasons why Hassan and his father left.