Likkutei Sichos Chayei Sarah
How Can Avraham Take An Oath Against G-d's Promise to Him?
Understanding Avraham's Strange Negotiation to Purchase the Cave
Rabbi YY Jacobson presentes this text-based shiur in a "sicha" (an address) of the Lubavitcher Rebbe, published in Likkutei Sichos vol. 30, Parshas Chayei Sarah, to a group of the Bais Shmuel Shul, in Brooklyn, NY.