Parashat Chayei Sarah marks the transition of the matriarchy from Sarah to Rivkah. A great deal of the narrative is devoted to the death and burial of Sarah on the one hand, and the search for a wife for Yitzchak on the other. Rabbi Yosef Dov Soloveitchik zt”l once noted that with the death of Sarah, “(Avraham) walks off the covenantal stage.” Despite his relative longevity, after Sarah’s passing Avraham seems to “disappear:” He ceases to be a major player, and the mantle of leadership passes to Yitzchak — and Rivkah. Apparently, the partnership between Avraham and Sarah was such that the death of one causes the focus to shift away from the other. Theirs was a complete, total partnership, and Avraham was keenly aware of the nature and importance of this partnership. Therefore, as soon as the burial and mourning period ended, he set out to find a woman who could partner with Yitzchak in the same way.