C. F. Keil and Franz Delitzsch on Daniel 2:18

Dan 2:18

The final clause depends on הודע (Dan 2:17). The ו is to be interpreted as explicative: and indeed, or namely. Against this interpretation it cannot be objected, with Hitz., that Daniel also prayed. He and his friends thus prayed to God that He would grant a revelation of the secret, i.e., of the mysterious dream and its interpretation. The designation “God of heaven” occurs in Gen 24:7, where it is used of Jehovah; but it was first commonly used as the designation of the almighty and true God in the time of the exile (cf. Dan 2:19, Dan 2:44; Ezr 1:2; Ezr 6:10; Ezr 7:12, Ezr 7:21; Neh 1:5; Neh 2:4; Psa 136:26), who, as Daniel names Him (Dan 5:23), is the Lord of heaven; i.e., the whole heavens, with all the stars, which the heathen worshipped as gods, are under His dominion.