מאשר חטא על הנפש, “for having sinned through contact with a corpse ”The incident is best compared to Judges 20,16: קולע אל השערה ולא יחטיא, “warriors accurate sling a stone and not to miss a hair that their arrow was aimed at.” Just as there are no warriors that are so accurate, so for a person when imbibing wine, it is impossible not to be affected by its effect on the body. In our verse, the Nazir, if he had been more circumspect would not have exposed himself to contact with a dead body. [His guilt, of course, was not intentional. Ed.]

יברכך ה' וישמרך, “may the Lord bless you and keep you safe;” you should be blessed with material wealth, and be able to fulfill many of the commandments of the Torah. The word שמר is interpreted in the same way in Exodus 12,17, ושמרתם את המצות, “you are to observe the commandments.” (compare Mechilta there) An alternate interpretation: יברך, “may He bless you with sons;” וישמרך, “and may He bless you with daughters,” (who require much more protection.)