Isaiah 21:12

The watchman, that is, the prophet to whom they turned in their affliction, said, The morning cometh and also the night, that is, no sooner would the morning dawn than it would be devoured once more by night and destruction; if ye will enquire, enquire ye, namely, in vain, as long as they continued in their enmity against the Lord. Return, come! For only by being converted to the God of Israel would they escape the threatened misfortune. This prophecy was exactly fulfilled, for Idumea was plunged from one affliction into the next, with barely a dawn of better days to relieve the night. The way of salvation for Edom as for all other people is that of repentance.