Albert Barnes Commentary Amos 9:5

"For the Lord, Jehovah of hosts, [is] he that toucheth the land and it melteth, and all that dwell therein shall mourn; and it shall rise up wholly like the River, and shall sink again, like the River of Egypt;" — Amos 9:5 (ASV)

And who is He who should do this? God, at whose command are all creatures. This is the hope of His servants; from where Hezekiah begins his prayer, Lord of hosts, God of Israel (Isaiah 37:16). This is the hopelessness of His enemies. That touches the land or earth, and it will melt, rather, has melted. His Will and its fulfillment are one. He spoke, and it was; He commanded and it stood fast (Psalms 33:9).

His Will is first, as the cause of what is done; in time they co-exist. He has no need to put forth His strength; a touch, the slightest indication of His Will, suffices. If the solid earth, how much more its inhabitants! So the Psalmist says, The pagan raged, the kingdoms were moved; He uttered His voice, the earth melted (Psalms 46:6). The hearts of men melt when they are afraid of His presence; human armies melt away, dispersed; the great globe itself shall dissolve into its ancient chaos at His Will.