Who said "He must have known he was dying."?

This quote is attributed to Harry Potter.

He must have known he was dying. - Harry Potter

"He must have known he was dying."

Harry Potter Death

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."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."