Encyclopedia Judaica (sv 'Herem') says that when a cherem was pronounced, a ceremony would be held in synagogue involving wax candles. Can anyone point to sources discussing this ceremony?
On the topic of Avos keeping the Torah as a whole: We know Avraham kept the Torah based on עקב אשר שמע אברהם לקולי, and by Yaakov there’s the drush of עם לבן גרתי תריג מצוות שמרתי. Anyone have a source that Yitzchak kept the entire Torah? There’s discussions of specific Mitzvos, such as Maaser, Pesach, etc., but I can’t find one that says he kept the Torah in its entirety.