Prisoner of Azkaban, chapter 21:
Snape took a step toward Dumbledore.
"Sirius Black showed he was capable of murder at the age of sixteen," he breathed. "You haven't forgotten that, Headmaster? You haven't forgotten that he once tried to kill me?"
As far as Snape's concerned, Sirius "proved himself capable of murder" when he gave Snape information
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