exploring etymology of a few words in each section starting on this program, relating to verses 1-15:

[O.Ir.] xwad-tav- > > [N.P.] xwadāy

[O.Ir.] -vant > > [N.P.] -vand

[O.Ir.] apara-tara- > > [N.P.] bartar

[M.P.] rūzīg- > > [N.P.] rūzī-

cf:

رزق، رزّاق

[M.P.] Šāhīgān > > [N.P.] Šāyigān , hamagān