Three matters are forbidden to a nazir: tumah, head-shaving, and products of the grapevine. There is an [aspect of greater] stringency to tumah and head-shaving than to products of the grapevine, in that tumah and head-shaving [cause] forfeiture, whereas the products of the grapevine do not cause forfeiture. There is an [aspect of greater] stringency to products of the grapevine than to tumah and head-shaving, in that there are no exceptions to the prohibition of the products of the grapevine whereas there are exceptions to the prohibitions of tumah and head-shaving —- where shaving is an obligation, and where there is an abandoned corpse. And there is an [aspect of greater] stringency to tumah than to head-shaving in that tumah causes forfeiture of all [the days previously observed] and one is obligated because of it [to bring] a sacrifice, whereas head-shaving causes forfeiture of only thirty days, and one is not obligated because of it to bring a sacrifice.