Shared ground
These two verses present Yahweh’s response to the injustices described just before (especially dishonest commerce and exploitation in Amos 8:4–6). The response is framed with an oath, signaling certainty rather than a mere warning. Yahweh says he will “never forget” their “works,” meaning the actions are remembered for accountability, not overlooked.
The passage then shifts to a picture of land-wide upheaval. The land “trembles,” and the effect reaches everyone living there: “everyone…mourn[s].” The river language (“rise up wholly…be troubled and sink again”) portrays a total disturbance that cannot be contained. The comparison to “the River of Egypt” points to the Nile (), evoking an overwhelming surge-and-fall pattern that people in the ancient world recognized as powerful and uncontrollable.
Where interpretation differs
What “the excellency of Jacob” refers to. Some read it as a title for Yahweh—Israel’s true “glory” or “strength”—so God swears by himself. Others read it as Israel’s “pride” or honored status (even the nation’s self-regard), meaning the oath is sworn by something bound up with Israel’s identity. Either way, the oath heightens the certainty of judgment.
How literal the land upheaval is. Some take the trembling and river-like rising as largely metaphorical language for national collapse (political, economic, and social convulsions). Others think the imagery may include (or be inspired by) real physical disaster (such as earthquake-like shaking), with the poetry interpreting that event as divine response. Many readings allow that prophetic poetry can be both: vivid metaphor that may also fit real-world catastrophes.
Why the disagreement exists
The Hebrew phrase behind “excellency/pride of Jacob” can naturally point either to God as Israel’s true glory or to Israel’s own status and honor-language. Also, prophetic speech often blends concrete disaster and poetic description; the passage gives strong sensory images but does not specify the mechanism (seismic event, invasion, or general societal collapse).
What this passage clearly contributes
Explicitly, the text asserts (1) Yahweh binds himself by oath to remember Israel’s actions for reckoning, and (2) the consequence is portrayed as whole-land shaking and whole-population mourning. Theologically inferred from the imagery and context is that social and economic wrongdoing is not “private” in its effects: the coming disruption is communal and comprehensive, described as a force as sweeping as a great river in flood.