Who said "I solemnly swear that I am up to no good."?

This quote is attributed to Harry Potter.

I solemnly swear that I am up to no good. - Harry Potter

"I solemnly swear that I am up to no good."

Harry Potter

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."