Jamieson, Fausset and Brown on Ezekiel 7:7

7. The morning--so Chaldean and Syriac versions (compare Joe 2:2). Ezekiel wishes to awaken them from their lethargy, whereby they were promising to themselves an uninterrupted night (1Th 5:5-7), as if they were never to be called to account [Calvin]. The expression, "morning," refers to the fact that this was the usual time for magistrates giving sentence against offenders (compare Eze 7:10, below; Psa 101:8; Jr 21:12). Gesenius, less probably, translates, "the order of fate"; thy turn to be punished.

not the sounding again--not an empty echo, such as is produced by the reverberation of sounds in "the mountains," but a real cry of tumult is coming [Calvin]. Perhaps it alludes to the joyous cries of the grape-gatherers at vintage on the hills [Grotius], or of the idolaters in their dances on their festivals in honor of their false gods [Tirinus]. Havernick translates, "no brightness."