民数記 6:2

כי יפלא means, IF HE CLEARLY UTTERS (cf. Rashi on Leviticus 22:21 and Note thereon). — Why is the section dealing with the Nazarite placed in juxtaposition to the section dealing with the סוטה? To tell you that he who has once seen a סוטה in her disgrace should abstain from wine, because it may lead to adultery (Sotah 2a). נדר נזיר — The term נזר wherever it occurs denotes “keeping aloof from something” (cf. Rashi on Leviticus 22:2). Here, too, it means that he keeps away from wine (Sifrei Bamidbar 22). להזיר לה׳ means, TO KEEP HIMSELF ALOOF from wine FOR THE SAKE OF HEAVEN (God).

דַּבֵּר֙ אֶל־בְּנֵ֣י יִשְׂרָאֵ֔ל וְאָמַרְתָּ֖ אֲלֵהֶ֑ם אִ֣ישׁ אֽוֹ־אִשָּׁ֗ה כִּ֤י יַפְלִא֙ לִנְדֹּר֙ נֶ֣דֶר נָזִ֔יר לְהַזִּ֖יר לַֽיהֹוָֽה׃

Speak to the children of Yisra᾽el, and say to them, When either man or woman shall pronounce a special vow of a Nazir to separate themselves to the Lord: