Erasmus Gass, «Jahwe oder der Perserkönig? Intertextuelle und semantische Studien zu Jes 40,10», Vol. 92 (2011) 503-527
Due to the chosen vocabulary and to intertextual connections, Isa 40,9-11 hint covertly at the Persian king who is responsible for the political turmoil that also affected the Babylonian Gola. The Persian king is characterized as a triumphant warrior (V. 10) and a caring shepherd (V. 11). Since Cyros administers the duties of a shepherd in Isa 44:28, he might be the one who acts on behalf of Yahweh here.