Nazir 3:3 - 3:4

נמצא יום שלשים סתר את הכל – for he was defiled in the midst of the days of his Naziriteship, and we don’t say that the thirtieth day counts both for here (i.e., the first Naziriteship) and there (i.e., the second Naziriteship), since part of a day is considered a complete day, but rather, when he shaved and brought his [hair] sacrifices on that day.

ר"א אומר אינו סותר אלא שבעה – for he holds that we say that part of a day is considered as a whole day and it is as if he became defiled after fulfilling [his Naziriteship], and defilement after fulfilling [his Naziriteship] according to Rabbi Eliezer does not lose anything other than seven [days].

הריני נזיר שלשים יום נטמא יום ל' סתר את הכל – whether according to Rabbi Eliezer or according to the Rabbis, for since he said, “I am a Nazirite for thirty days,” everyone agrees that we require thirty complete days, and we don’t say in this that part of a day is considered a whole day. And Rabbi Eliezer who holds that a person (i.e., a Nazirite who is defiled on the fulfilling [the vow] exactly, loses only the thirtieth day and does not lose it all, we derive it from a Biblical verse, as it is written (Numbers 6:13): “This is the ritual of the nazirite: On the day that his term as Nazirite is completed.” If he is defiled on the day of completion, give him the Torah of Naziriteship, meaning to say an unspecified period of Naziriteship is thirty days; here that he said: “I am a Nazirite for thirty days,” and he was defiled on the thirtieth day which is the day of completion, since he lost all thirty, he lost everything. But the Rabbis also who dispute that of Rabbi Eliezer and state that someone who is defiled on the day of completion has lost everything and even if he counted a few days here, for when he said, “I am a Nazirite for thirty days and was defiled on the day of completion, since he also lost the thirtieth day, he lost everything; therefore, whether according to Rabbi Eliezer or according to the Rabbis, he lost everything, and in everything where Rabbi Eliezer and the Sages dispute, the Halakha is according to the Sages.

הריני נזיר מאה יום נטמא יום מאה סתר את הכל – The Rabbis, according to their reasoning, that state that if he was defiled on the day of completion, it is as if he was defiled within his time [of the vow], and loses everything.

ר"א אומר אינו סותר אלא ל' – for he (i.e., Rabbi Eliezer) holds that if he was defiled on the day of completion, he only loses thirty [days].

נטמא יום מאה ואחד – according to the Rabbis, he loses thirty [days], for they decreed that the one-hundred and first day which is the day of shaving, is on account of the one hundredth day. But nevertheless, they were not more stringent than him to make it like the one hundredth day which is the day of completion on which he would lose everything, and they decreed that he would lose only an unspecified Naziriteship which is only thirty days.

ור"א אומר אינו סותר אלא שבעה – and he goes according to his reasoning that even on the thirtieth day, he did not decree when a person says, “I am a Nazirite for an unspecified time.”