Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 204
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 204, with English translation by Maimonides (Rambam).
שלא יאכל ענבים יבשים, שנאמר "ויבשים לא יאכל" (במדבר ו,ג).
[For a Nazarite] not to eat raisins, as [Numbers, ibid.] states: "[He shall not eat]... dried grapes."