Avraham passed away and died at a good age, elderly and full of days and he was gathered to his people. (Bereshith 25:8) The day that Avraham our father departed from the world, the great men of the nations stood in line and said: Woe to a world that has lost its leader, and woe to a ship that has lost its captain.(Baba Batra 91a)
In trying to obtain a piece of land to bury Sara, Avraham gets heavily involved in lengthy negotiations (Bereshith, chapter 23). After he has turned to the children of Chet, he asks them to speak to Efron the son of Tzohar who is the owner of the Cave of Machpela. It is in this cave that he would like to bury his dear wife Sara.