Negative commandment · Lo Ta’aseh #202 of 613
That the nazirite not drink wine or all types of spirits
שלא ישתה הנזיר יין, ולא דבר שנתערב בו יין וטעמו כטעם יין
The verse · Bamidbar 6:3
מִיַּיִן וְשֵׁכָר יַזִּיר חֹמֶץ יַיִן וְחֹמֶץ שֵׁכָר לֹא יִשְׁתֶּה וְכׇל־מִשְׁרַת עֲנָבִים לֹא יִשְׁתֶּה וַעֲנָבִים לַחִים וִיבֵשִׁים לֹא יֹאכֵל
“he shall abstain from wine and strong drink, and shall drink no vinegar of wine, or vinegar of strong drink, nor shall he drink any liquor of grapes, nor eat moist grapes, or dried.”
The Rambam’s words
For a Nazarite not to drink wine or partake of anything in which wine was mixed and has the taste of wine, as [Numbers 6:3] states: "He shall not drink any grape beverage." [This prohibition applies] even if the wine or other beverage with which the wine was mixed has become sour, as the above verse states: "He may not drink vinegar from wine or wine-brandy."
שלא ישתה הנזיר יין, ולא דבר שנתערב בו יין וטעמו כטעם יין, שנאמר "וכל משרת ענבים" (במדבר ו,ג); ואפילו החמיץ היין או דבר שנתערב בו היין, הרי זה אסור עליו, שנאמר "חומץ יין וחומץ שיכר לא ישתה" (שם).
Who & when
“And this prohibition is practiced by males and females in every place and at all times, as anyone who vows [to become a] nazirite is obligated to abstain from wine, spirits, wine vinegar, spirit vinegar and from any grape marinade.”
Where in the Mishneh Torah
Hilchot Nazariteship הלכות נזירות