Obadiah

God was not pleased with the historical rebellion of the people of Judah. For generation they had been walking away from God. Little by little they substituted man-made rules for divine revelation. So God sent Babylon to punish Judah. But God did not send Edom to execute his judgment on Judah. So when the people of Edom took advantage of Judah's exposure they followed Judah's pattern of substituting their standards for God's. In verses 10 through14 God list nine transgressions that Edom committed against the people of Judah. Sins that not only violated God's law but human sensibilities; which are a reflection of God's nature. Edom's judgment was earned by their actions of selfish rebellion.
Stuart