לנפש לא יטמא בעמיו, a man belonging to the “nation” of priests must not defile himself by contact with a dead human being. The word בעמיו “of his people,” is used here in the same sense as in verse 14 later on where the Torah decrees that the only suitable marriage partner for a High Priest [if he was not married at the time of his appointment. Ed.] is בתולה מעמיו, “a virgin from his people.” If the Torah had written here לעמיו instead of בעמיו, the meaning would have been more restrictive, i.e. that the priest must only not defile himself by contact with a Jewish corpse. Similar constructions involving the expression לעמיו are found in Numbers 6,7 The expression לנפש allows leeway, as we know from the subsequent verse where it is permitted for the priest or even mandated that he defile himself on the corpses of his closest relatives.

לא יטמא בעל בעמיו, no husband among the tribe of the priests is to defile himself ritually

להחלו, as he would thereby desecrate his status as a priest. According to the words of our sages (compare Rashi) he is not to so defile himself if his dead wife had been someone whom a priest should not have married in the first place, such as a divorcee; however, he is entitled or obligated to defile himself for the sake of burying a wife whom he was legally entitled to have married.

לא יקרחה קרחה, both he and an ordinary Israelite are not to make bald spots on their heads as a sign of mourning. (compare Deuteronomy 14,1)

וחללה, a daughter of the category of people of whom the Torah had warned in verse 15 that by marrying them he would desecrate his seed.

ובת איש כהן, a girl who is already betrothed to be married. The details of this legislation are explained in Sanhedrin 50.

חרום ושרוע, the details of this physical blemish have been explained in Bechorot 43 and 40 respectively.

מרוח אשך, whose testicles have been crushed.