Going back to the times of the Matriarchs and Patriarchs, Jewish tradition has seen great importance in burying the dead in a permanent grave, ideally in a family plot.
According to the Mishna (108a), among the categories of people who inherit we find that a man will receive his wife’s estate upon her death, although she will not receive his estate should he die first. Today’s daf opens in the midst of a search for the source for the law that gives the husband the right to inherit, something that is out-of-the-ordinary in a list of blood relatives who inherit one another. The Gemara points to a passage in Sefer Yehoshua (24:33) where we learn that Aharon’s son, Elazar HaKohen, was buried in the land of his son, Pineḥas. How might Pineḥas come to have land that did not belong to his father? The Gemara concludes that Pineḥas must have married someone from a different tribe, and he received the land as an inheritance from her.
Abaye objects to this proof, arguing that Pineḥas may simply have purchased the land on which his father was buried. To this suggestion the Gemara responds that Elazar HaKohen could not possibly have been buried in land that was purchased, since such land would be returned to its owner at the yovel and this righteous man would turn out to be buried in land that did not belong to him and his family.