Rashi on Leviticus 22:13/רש"י על ויקרא כ״ב:י״ג

1אלמנה וגרושה [BUT IF A PRIEST'S DAUGHTER BE] A WIDOW OR DIVORCED WIFE of the layman mentioned in the preceding verse,

2וזרע אין לה AND SHE HATH NO DESCENDANTS — from him (from the layman) (Sifra; Yevamot 87a),

3ושבה THEN SHE MAY RETURN [UNTO HER FATHER'S HOUSE AS IN HER YOUTH AND MAY EAT OF HER FATHER’S BREAD] — if, however, she has descendants from him she is forbidden to eat as long as the descendants (cf. Yevamot 87a) are alive.

4וכל זר לא יאכל בו BUT THERE SHALL NO LAYMAN EAT THEREOF — The repetition of the prohibition already mentioned in v. 10 intends nothing else than to exclude from it the אונן — i. e. that he (the אונן) is permitted to eat תרומה. [Scripture, as it were, says here:] The status of being a non-priest, I tell you, debars one from eating תרומה but not that of being an אונן (Yevamot 68b).