When the Rabbis divided the Torah into its 54 parashiyot (portions), they generally arranged for each portion to begin with a unique or otherwise significant word that would in some way summarize major themes of the entire section.
You shall each revere your mother and your father, and keep My sabbaths: I the Eternal am your God. (Leviticus 19:3)
Acharei Mot, the first of this week's two parashiyot, begins on an unsettling note—a reminder of the death of Aaron's sons and the suggestion that such tragedies might occur again unless the priests take specified steps to prevent them
In Leviticus 18:3, in Acharei Mot, it is written, "You shall not copy the practices of the land of Egypt where you dwelt, or of the land of Canaan to which I am taking you."
This week's Torah portion, Acharei Mot, "After the death" [of two of Aaron's sons], continues the focus on ritual purity that began earlier in Leviticus, and begins the section of the book known as the Holiness Code.