כי יפלא מתיבות שיש להם שני פנים בפירושם לשון סתירה ולשון בנין שהרי מצינו כי יפלא ממך דבר למשפט. ונסמכה פרשת נזיר לפרשת סוטה ללמד שרובי עבירות סבת יין ואשה שלא תתקן את שער ראשה אינה מבקשת להבעל. כי יפלא, this is one of the words which occur in different contexts, having opposite meanings, such as “building” or “demolishing.” For instance, we find the phrase (Deut. 17,8) כי יפלא ממך דבר, where it means: “if something is too baffling for you, etc;” (the reference is to litigation between two parties) In our situation, our sages presume that the subject of the vow of Nazirite was not inserted here haphazardly, but that it teaches a valuable lesson in how to preserve one’s sinfree status. Our sages surmise that the reason that this subject follows on the heels of that of the wayward wife, is that man falling victim to sinning is related to imbibing too much wine or alcoholic drink, something that loosens not only one’s tongue, but also other restraints that would have served as protection against committing certain sins.[The reader may recall that Lot having been given too much wine by his daughters, resulted in the first instance of incest, so that the founder of the people of Moav’s founding father was at the same time also his grandfather through his mother. Eventually, 24000 Israelites were killed by a plague for having made an obeisance to a Moabite idol, BaalPeor, after having drunk too much wine and slept with Moabite women who had been told by Bileam to find a way to seduce them. Ed.] According to our author, a woman who has not coiffed her hair properly is not in demand for sexual intercourse. (Based on Ibn Ezra)
נדר נזיר להזיר כנגד שלשה ענינים שבנזיר יין תגלחת טומאה. נדר נדר להזיר, “has uttered a vow to become a Nazirite.” The reason why the Torah chose such a cumbersome way of saying this is that it wanted to incorporate the three main aspects of the Nazirite’s vow: abstention from wine, etc; not shaving his hair, and avoiding contact with ritual impurity.