Sforno on Numbers 6:2/ספורנו על במדבר ו׳:ב׳

1כי יפליא, he will separate himself from all the vanities and physical pleasures in life.

2לנדור נדר נזיר, to become a Nazirite and the life of self denial which comes with this.

3'להזיר לה, to separate himself from all the pleasures in order to devote himself exclusively to the service of the Lord, to study His Torah and practice walking in His ways.