'Adversary' in the Bible

“Warn the [neighboring] nations now [that our enemy is coming]!Announce to Jerusalem,‘Besiegers are coming from a far country,And they lift their voices and shout against the cities of Judah.

For thus said Jehovah: Lo, I am slinging out the inhabitants of the land at this time, And have been an adversary to them, So that they are found out.