All the days of his separation he shall eat nothing that is produced by the grapevine, not even the seeds or the skins.
After the law for the discovery and shame of those that by sin had made themselves vile, fitly follows this for the direction and encouragement of those who by their eminent piety and devotion had made themselves honourable, and distinguished themselves from their neighbours.
Commenting on Numbers 6:1-21
All the days of his separation shall he eat nothing that is made of the vine tree,.... Of its leaves, branches, and fruit, especially the latter, put into any sort of food, or infused into any liquor, or mixed with any sauce for food: the days or time of separation were according as the vow was made, for a shorter or longer time; though the...
Num 6:3-4 The vow consisted of the three following points, Num 6:1-4 : In the first place, he was to abstain from wine and intoxicating drink (shecar, see Lev 10:9); and neither to drink vinegar of wine, strong drink, nor any juice of the grape (lit., dissolving of grapes, i.e., fresh must pressed out), nor to eat fresh grapes, or dried (raisins).
Commenting on Numbers 6:3-4