Insulting a Eunuch [Rashi: Sadducee] who attacked him: Shabbat 152a
Rebbe asked Rabbi Yehoshua ben Karcha how he merited such a long life. When Rabbi Yehoshua asked him whether he felt it was time for him to die, Rebbe replied that he considered the answer Torah, and therefore requisite for his education: Megillah 28a
Rabbi Yehoshua ben Karcha's blessing to Rebbe: Megillah 28a