Toldos – Vol. 15 sicha 1

From Likutei Sichos - Rabbi Chaim Wolosow by R Chaim Wolosow.

The difference between Ishmael son of Avraham who is not regarded as a Jew (even though he did Teshuva) and Esau son of Yitzchak who is Jewish https://www.torahrecordings.com/likutei-sichos/015/007_001