Charles Ellicott Commentary Numbers 6:4

"All the days of his separation shall he eat nothing that is made of the grape-vine, from the kernels even to the husk." — Numbers 6:4 (ASV)

From the kernels even to the husk. —The word translated as kenels is thought by some to mean sour grapes, and by others the kernels of berries. The word zag denotes the shell or husk.