In Amos 1:6 "Thus says the Lord: “For three transgressions of Gaza, and for four, I will not revoke the punishment, because vthey carried into exile a whole people to deliver them up to Edom."
And three verses later: "Thus says the Lord: “For three transgressions of Tyre, and for four, I will not revoke the punishment, because they delivered up a whole people to Edom, and did not remember the covenant of brotherhood."
Historically speaking, what was the exile that they delivered to Edom, and which covenant did they not remember? These verses are extremely vague, and need some serious clarification (historically and archaeologically). If anyone can shed some light on these ambiguous verses i would greatly appreciate.