Amos 3:9

Publish in the palaces at Ashdod, and in the palaces in the land of Egypt, and say, Assemble yourselves upon the mountains of Samaria, and behold the great tumults in the midst thereof, and the oppressed in the midst thereof.

Proclamation is to be made in the palaces at Ashdod and in the palaces in Egypt, calling foreign peoples to assemble themselves upon the mountains of Samaria. They are summoned there as witnesses to look upon what is happening in the midst of the city. What they are to behold is the great tumults within it and the oppressed in the midst of it, with violence and oppression laid open before outside observers. The guilt to be seen is that the leaders store up violence and robbery in their palaces, so that the evidence of wrongdoing is public and undeniable. That open evidence is the ground of the judgment announced against Israel, that an adversary shall surround the land, bring down its strength, and plunder its palaces.