Reference for Avodah Zarah 76:15

שתיתאה רב שרי אבוה דשמואל ולוי אסרי בחיטי ושערי כ"ע לא פליגי דשרי בטלפחי דחלא כ"ע ל"פ דאסיר כי פליגי בטלפחי דמיא מר סבר גזרינן הא אטו הא ומר סבר לא גזרינן

As for shetita [cooked by a non-Jew]: Rav permits it but Shmuel’s father and Levi prohibit it. If it is made from wheat or barley, they all agree that it is permitted. If from lentils and vinegar all agree that it is prohibited; Where there is disagreement is when it is made from lentils and water. [Shmuel’s father and Levi] hold that we prohibit it out of fear [that being permitted with water people will drink it when it has been prepared with vinegar], whereas [Rav] held that we do not prohibit it.

Jastrow