Reference for Chullin 186:39

בכשעורה רבי יוחנן אמר

Have the generations then become more virtuous? - At first they [the Sages] held the view of R'Judah, and later they held the view of R'Meir; and as long as people still remembered the view of R'Judah, they were not to be trusted, but now that R'Judah's view has been forgotten they are to be trusted.

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