Parashas Naso
וְכִֽי־יָמ֨וּת מֵ֤ת עָלָיו֙ בְּפֶ֣תַע פִּתְאֹ֔ם וְטִמֵּ֖א רֹ֣אשׁ נִזְר֑וֹ וְגִלַּ֤ח רֹאשׁוֹ֙ בְּי֣וֹם טׇהֳרָת֔וֹ בַּיּ֥וֹם הַשְּׁבִיעִ֖י יְגַלְּחֶֽנּוּ׃
If someone dies suddenly nearby,dnearby Cf. 19.14–16. defiling [a nazirite’s] consecrated hair, they shall shave their head at the time of becoming pure, shaving it on the seventh day.
Torah Temimah points to TT / Nazir (verified).
בפתע פתאום — תניא, פתע זה שוגג, פתאום זה מזיד.
English: “Suddenly (besheta petom)” — it was taught: “peta” is unintentional; “pitom” is intentional.
Custom
Chazal distinguish unintentional and intentional impurity that interrupts the naziriteship.