3). YHWH's Judgment On Tyre (Amos 1:9-10).
Israel's third most dangerous enemy was Tyre. They had in the past had a close treaty relationship with Israel (e.g. under David, Solomon and Ahab. See 2 Samuel 5:11; 1Ki 5:1; 1 Kings 5:11; 1 Kings 16:31), but this had broken down (possibly after Jehu slew Jezebel of Tyre) so that Tyre, like Philistia, had commenced raids over the border in order to seize whole towns for the purpose of selling them as slaves to Edom. It is clear that Edom had established a wholesale market in slaves, which was being fed by Philistia and Tyre. And they had each one chosen to do it to God's people.
“Thus says YHWH.
For three transgressions of Tyre, yes, for four,
I will not turn away their punishment,
Because they delivered up the whole people to Edom,
And did not remember the brotherly covenant.
But I will send a fire on the wall of Tyre,
And it will devour their palaces.”
So thirdly YHWH has spoken against Tyre. In Tyre's case their continual seizing of slaves out of Israel was seen as especially heinous because of their former good treaty relationship. They had forgotten ‘the brotherly covenant' and had continually transgressed, not once or twice but time and again. They too, therefore, would in the future suffer the fires of judgment as their territory was invaded and their cities conquered. Such trading in slaves would later become a hallmark of the evil of Tyre (Joel 3:6; Ezekiel 27:13).
The omission of a final description of judgment and a concluding ‘word of YHWH' here and in the case of Edom would appear to be in order to link Philistia, Tyre and Edom as combined together in the foul trade in human beings.