Reference for Avodah Zarah 74:6
דאורייתא דיקרב טמא דיקרב בדיקרב טהור ואתו אינהו וגזור אפילו דיקרב בדיקרב ואתא איהו ואוקמה אדאורייתא
According to the Torah he who comes in contact with a corpse is defiled, but anybody who comes in contact with this person is pure; and [the rabbis] proceeded to decree that even one who has contact with one who had contact [with a dead body] is defiled. And then [Yose b. Yo'ezer] came an established the law according to the Torah.
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