What does Obadiah 1:13 mean?
When Israel was attacked by Babylon in 587 BC, Edom helped the invaders track down and capture fleeing Jews. In reward, Nebuchadnezzar allowed the Edomites to participate in the looting of Jerusalem. Edom has already been accused of mocking Israel during their struggle (Obadiah 1:12), and now they are actively participating in her misery. Verse 5 pointed out that even thieves take only what they want, leaving the rest behind. For Edom to help while Israel is completely ruined is pure spite.The perspective of verses 12, 13, and 14 is a common technique in ancient literature. The author speaks as if shouting back in time, to warn someone. The crimes Edom is being told "do not" do are the very ones they have already done. A frequent feature of God's judgment is a sinner's own crimes coming back to them. Edom looted Jerusalem and helped defeat them. Not long after this prophecy was written, the Edomites were driven from their lands by foreigners. Their nation wallowed in poverty and obscurity until 70 AD, when the Roman Empire virtually annihilated them.
This verse repeatedly refers to a "day of calamity," emphasizing how dire the situation was for Israel.