Similarly, [if] one cohabits with [any] one of the arayos [forbidden] in the Torah, or those disqualified [from marriage] —- for example, a widow to a Kohen Gadol, a divorcee or chalutzah to an ordinary Kohen, a mamzeress or Nesinite to a Yisrael, or the daughter of a Yisrael to a mamzer or Nesinite —- he has disqualified [her]. There is no distinction between the forms of cohabitation.

A widow [who was married] to a Kohen Gadol, [or] a divorcee or chalutzah [who was married] to an ordinary Kohen —- [even if they were only] betrothed, they may not eat terumah; R' Elazar and R' Shimon [however] validate [it]. [If] they were widowed or divorced —- [if it was] from marriage, they are disqualified; [but if] from betrothal, they are qualified.

A Kohen Gadol may not marry a widow, neither a widow from betrothal nor a widow from marriage. And he may not marry a bogeres; R' Elazar and R' Shimon [however] validate [marriage] with a bogeres. He may not marry the victim of a blow.  [If] he betrothed a widow and was [then] appointed Kohen Gadol, he may marry [her]. It happened that Yehoshua ben Gamla betrothed Marsa, the daughter of Baisos, and the king [then] appointed him to be Kohen Gadol, and he married her.  [If] a widow awaiting her yavam fell to an ordinary Kohen, and he was [then] appointed to be Kohen Gadol, even if he [had already] performed maamar with her, he may not marry [her]. [If] a Kohen Gadol's brother died, he performs chalitzah, but not yibum.

An ordinary Kohen may not marry an ailonis, unless he has a wife or children. R' Yehudah says: Even if he has a wife or children he may not marry an ailonis, because she is the zonah mentioned in the Torah. The Sages, however, say: Zonah refers only to a female convert, or a freed slavewoman, or one who engaged in a forbidden cohabitation.