民数記 6:11

מאשר חטא על הנפש [AND THE PRIEST … MAKE EXPIATION FOR HIM] FOR THAT HE HATH SINNED BY THE DEAD — i.e., that he has not been on his guard against defilement by a corpse. — R. Eleazer ha-Kappar said, “his sin consists in that he has afflicted himself by abstaining from the enjoyment of wine (Sifrei Bamidbar 30; Nazir 19a). וקדש את ראשו AND HE SHALL HALLOW HIS HEAD [THAT SAME DAY] by beginning again the counting of his Nazaritehood (i.e., he resumes his Nazaritehood).

וְעָשָׂ֣ה הַכֹּהֵ֗ן אֶחָ֤ד לְחַטָּאת֙ וְאֶחָ֣ד לְעֹלָ֔ה וְכִפֶּ֣ר עָלָ֔יו מֵאֲשֶׁ֥ר חָטָ֖א עַל־הַנָּ֑פֶשׁ וְקִדַּ֥שׁ אֶת־רֹאשׁ֖וֹ בַּיּ֥וֹם הַהֽוּא׃

and the priest shall offer the one for a sin offering, and the other for a burnt offering, and make atonement for him, for that he sinned by the dead, and shall hallow his head that same day.