Here "pride of Jacob" is a title for Yahweh. Also "Jacob" represents his descendants, the Israelites. AT: "Yahweh has sworn by himself, saying" or "Yahweh, of whom the Israelites are so proud, has sworn" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Amos uses a question to emphasize that these things will certainly happen. AT: "Yahweh will cause the land to shake, and every one who lives in it will mourn." (See: [[rc://en/ta/man/translate/figs-rquestion]])
# All of it will rise up like the Nile River ... like the river of Egypt
Amos compares the rising and sinking of the waters of the Nile River to how Yahweh will cause the land to shake when he judges the people. (See: [[rc://en/ta/man/translate/figs-simile]])