Reference for Makkot 47:22
אוטם אזנו משמוע דמים דלא שמע בזילותא דצורבא מרבנן ושתיק כגון ר"א ברבי שמעון
"Who stops his ears from hearing bloodshed", that he does not hear a degradation of one of the Rabbis and remain silent, like Rebbi Elazar b'Rebbi Shimon.
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