C. F. Keil and Franz Delitzsch on Obadiah 1:4

Oba 1:4

Oba 1:4 shows the worthlessness of this reliance of the Edomites. The object to תּגבּיהּ, viz., קנּך, does not follow till the second clause: If thou makest thy nest high like the eagle, which builds its nest upon the loftiest jagged rocks (Job 39:27-28). This thought is hyperbolically intensified in the second clause: if thy nest had been placed among stars. שׁים is not an infinitive, but a passive participle, as in the primary passage, Num 24:21, which Obadiah had before his mind, and in 1Sa 9:24; 2Sa 13:32; but קנּך is nevertheless to be taken as an accusative of the object, after the analogy of the construction of passives c. accus. obj. (see Ges. §143, l, a.).