For the source text click/tap here: Avodah Zarah 37
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Yosei ben Yo’ezer ish Tzereida was the first head of the pairs of scholars who are mentioned at the beginning of Massekhet Avot, a student of Antigonos ish Sokho. At that time, scholars were not given titles and were simply called by their names. According to the Talmud, Yosei ben Yo’ezer, who was a kohen, lived during the period when the Jewish leadership in Jerusalem was made up of Hellenists. He was put to death by his nephew Alcimus, who was an evil kohen, and died a martyr’s death.
He was known as the ḥasid she-bakehuna – the righteous among the priests – because he was particularly strict about issues of ritual purity. It was he who instituted the Rabbinic ordinance declaring the lands of the Diaspora to be considered ritually defiled. Although he was known for his strict positions in this area of halakha, in other fields he was known to be lenient – so much so that he is sometimes referred to as Yosei sharya – “Yosei the Permissive.”