“The day of Yahweh
Is near
Against all the nations.
As you have done,
It shall be done
To you.
Your deeds
Shall return
On your own head.”
Obadiah warned that the day of Yahweh, as in the prophet Amos, was coming to all the countries, since it was near. As they have done, so it shall be done to them, since their deeds would return to their own head.