Jamieson, Fausset and Brown on Obadiah 1:2

2. I have made thee small--Thy reduction to insignificance is as sure as if it were already accomplished; therefore the past tense is used [Maurer]. Edom then extended from Dedan of Arabia to Bozrah in the north (Jr 49:8, 13). Calvin explains it, "Whereas thou wast made by Me an insignificant people, why art thou so proud" (Ob 3)? But if so, why should the heathen peoples be needed to subdue one so insignificant? Jr 49:15, confirms Maurer's view.