[If he says:] “It is [an obligation] upon me [to provide for the] shaving of half a nazir,” and his friend heard [him] and said, “And I, it is [an obligation] upon me [to provide for the] shaving of half a nazir” —- this one must [provide for the] shaving of a complete nazir, and this one must [provide for the] shaving of a complete nazir; [these are] the words of R’ Meir. But the Sages say: This one provides half [of the sacrifices needed] to shave a nazir, and this one provides half [of the sacrifices needed] to shave a nazir.