3האוֹמֵר הֲרֵינִי נָזִיר וְנָזִיר כְּשֶׁיִּהְיֶה לִי בֵּן. וְהִתְחִיל נְזִירוּת שֶׁלּוֹ וְאַחַר כָּךְ נוֹלַד לוֹ בֵּן. מַשְׁלִים אֶת שֶׁלּוֹ וְאַחַר כָּךְ מוֹנֶה אֶת שֶׁל בְּנוֹ. אָמַר הֲרֵינִי נָזִיר כְּשֶׁיִּהְיֶה לִי בֵּן וַהֲרֵינִי נָזִיר כָּךְ וְכָךְ יוֹם. וְהִתְחִיל בִּנְזִירוּת שֶׁלּוֹ וְאַחַר כָּךְ נוֹלַד לוֹ בֵּן. פּוֹסֵק נְזִירוּת שֶׁלּוֹ וּמוֹנֶה אֶת שֶׁל בְּנוֹ וְאַחַר כָּךְ חוֹזֵר וּמַשְׁלִים אֶת שֶׁלּוֹ וַהֲרֵי שְׁתֵּיהֶן כִּנְזִירוּת אַחַת. לְפִיכָךְ אִם נִטְמָא בְּתוֹךְ נְזִירוּת שֶׁל בְּנוֹ סוֹתֵר הַכּל. נִטְמָא אַחַר נְזִירוּת בְּנוֹ כְּשֶׁהִתְחִיל לְהַשְׁלִים נְזִירוּתוֹ אֵינוֹ סוֹתֵר אֶלָּא עַד נְזִירוּת בְּנוֹ. וּבְכַמָּה יָמִים מַשְׁלִים אֶת שֶׁלּוֹ. אִם נִשְׁאַר מִנְּזִירוּתוֹ כְּשֶׁנּוֹלַד הַבֵּן שְׁלֹשִׁים אוֹ יוֹתֵר מוֹנֶה נְזִירוּת בְּנוֹ וּמַשְׁלִים הַיָּמִים שֶׁנִּשְׁאֲרוּ מִנְּזִירוּתוֹ. וְאִם נִשְׁאֲרוּ מִנְּזִירוּתוֹ פָּחוֹת מִשְּׁלֹשִׁים מוֹנֶה שְׁלֹשִׁים אַחַר נְזִירוּת בְּנוֹ. שֶׁאֵין בֵּין תִּגְלַחַת לְתִגְלַחַת פָּחוֹת מִשְּׁלֹשִׁים יוֹם:
When a person says: "Behold I am a nazirite, and [will be] a nazirite should a son be born to me," if he began observing his nazirite vow and then a son was born to him, he should complete his own nazirite vow and then begin counting [the one associated with] his son. [The following rules apply if] he said: "Behold I will be a nazirite should a son be born to me and behold I am a nazirite for these-and-these days." If he began [observing] his own nazirite vow and then a son was born to him, he should interrupt [the counting of] his vow and begin counting [the one associated with] his son. Afterwards, he goes back and completes his own vow. They are both considered as one nazirite vow. Therefore if he becomes impure in the midst of the nazirite vow [associated with] his son, he invalidates everything. If he became impure after [completing] the nazirite vow [associated with] his son, he invalidates only [the days after the completion of] the nazirite vow [associated with] his son. For how many days [must he observe the nazirite laws] to complete his own [nazirite] vow? If there remained 30 days or more [from the days he was required to observe for] his nazirite vow after his son was born, he should observe the nazirite vow [associated with] his son and then complete the days remaining from his own nazirite vow. If less than 30 days remain from his nazirite vow, he must count 30 days after the nazirite vow [associated with] his son, for there is never less than 30 days between one shaving [associated with the conclusion of a nazirite vow] and another.