For the source text click/tap here: Nazir 49
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When Rabbi Meir passed away the collegial Sage who regularly disputed his rulings, Rabbi Yehuda, was greatly concerned that he would come under attack from his colleague's disciples. He therefore urged his own disciples to prevent them from attending his Torah dissertations lest they attempt to challenge him just for the sake of proving him incorrect.
One of Rabbi Meir's disciples, the Sage Sumchus, somehow forced his way in and did challenge something that Rabbi Yehuda said. In our gemara it was in connection with Rabbi Meir's statement about a nazir's contact with the dead. In the Mesechta Kiddushin (52b) the challenge was regarding a statement by Rabbi Meir about a kohen using the flesh of a sacrifice to make kiddushin.
In both of these cases Rabbi Yehuda became angry at his disciples for permitting the challenger to enter and he summarily dismissed the challenges.
We explore this fascinating Amorah a disciple of R. Akiva and Acher