רבי יצחק בר אבא

Rabbi Yitzchak bar Abba was an amora. He appears in the Talmud in tractate Ketubot, where a teaching is brought in his name — with the alternate attribution to Rabbi Yitzchak bar Avin — on the distinction between two cases: one whose own deeds bring her liability and one whose verbal act (the “twisting of his lips”) brings his liability. The discussion turns on the precise moment when liability attaches and on the status of the young woman at that time.