על החוקים לפרטיהם, ספר א כ״בOn the Special Laws, Book I 22
א׳
1[110] Further, it made clear distinctions as to the birth of the intended wives. The high priest must not propose marriage save to one who is not only a virgin but a priestess descended from priests, so that bride and bridegroom may be of one house and in a sense of the same blood and so, harmoniously united, shew a lifelong blending of temperament firmly established.
ב׳
2[111] But the rest are permitted to marry the daughters of others than priests partly because the restrictions required to maintain their purity are slight, partly because the law did not wish that the nation should be denied altogether a share in the priestly clanship or be entirely excluded from it. This was the reason why he did not forbid the other priests to intermarry with the laity of the nation, for intermarriage is kinship in the second degree. Sons-in-law are sons to their fathers-in-law, and the latter are fathers to the former.