Who said "Buckbeak was innocent."?

This quote is attributed to Harry Potter.

Buckbeak was innocent. - Harry Potter

"Buckbeak was innocent."

Harry Potter Justice

Character in Harry Potter and the Prisoner of Azkaban

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"A true friend would never stop believing in you."

"Strength comes from within."

"The map shows us something we never dreamed of."

"Some people are worth saving."

"Justice must always prevail."

"You think I'm just some animal?"

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

"Justice is worth fighting for."