Shared ground
These opening lines present Jonah’s mission as starting with God’s initiative, not Jonah’s idea. The story begins with “the word of Yahweh” coming to Jonah, identified as “the son of Amittai,” which treats him as a real, named messenger in Israel.
God’s command is clear and specific: Jonah must get up, travel to Nineveh, and make a public announcement “against” it. Nineveh is highlighted as “that great city,” marking it as significant. The stated reason is moral: Nineveh’s wickedness has “come up before” Yahweh, meaning their wrongdoing has become a matter that demands God’s attention.
Where interpretation differs (only where needed)
Some difference shows up in what “that great city” is emphasizing. It can be read mainly as size and importance, or as power and prominence (including why it would feel intimidating).
Another difference is what “preach against it” implies in content. It could be understood as a warning of coming judgment, an accusation that exposes wrongdoing, or a broader announcement of God’s opposition to the city’s practices (with the exact message to be specified later in the book).
A smaller question is how to take “their wickedness has come up before me.” Some read it as a vivid way of saying their evil is widely known and has reached a critical point. Others hear formal notice language: God, as ruler, is taking up the case.
Why the disagreement exists
The phrases “great city,” “preach against,” and “has come up before me” are brief and somewhat flexible in ordinary speech. Jonah 1:1–2 gives the assignment and the reason, but not the full sermon content or a detailed explanation of Nineveh’s greatness. That leaves readers to infer emphasis from the broader story.
What this passage clearly contributes
This passage establishes that God’s concern and authority extend beyond Israel’s borders, reaching even a major foreign city. It also frames the mission as morally driven: the problem is Nineveh’s wickedness, and the response is a commissioned proclamation against it. Finally, it sets up the main tension for what follows: Jonah’s next actions will be evaluated against a direct, unambiguous call (Jonah 1:3).