Shared ground
These two verses portray a power struggle over speech. Balak wants Balaam’s words controlled for political ends, but Balaam insists his speech is bound to Yahweh’s direction. On the surface, Balak is not merely disappointed; he tries to stop the whole process by forbidding both possible outcomes—no curse and no blessing (v.25).
The text also treats spoken pronouncements as consequential actions, not harmless commentary. Balak’s request assumes words can shape events and public morale. Balaam’s response assumes Yahweh’s word cannot be managed by a patron.
Where interpretation differs
What Balak is trying to achieve. Some read Balak’s “neither curse…nor bless” as a demand for silence or withdrawal—better to say nothing than keep publicly blessing Israel. Others read it as a demand for a neutral, noncommittal statement (something like “don’t take sides”), not total silence.
How strong Balaam’s “I must do” is. Some understand Balaam as describing real compulsion: once Yahweh speaks, Balaam has no freedom to alter the message. Others think Balaam is emphasizing obligation and limits (he will not, or cannot, perform as hired) without claiming he is mechanically forced in every sense.
Why the disagreement exists
The wording is brief and confrontational, without spelling out whether Balak means “stop talking” or “stop taking a side.” Likewise, “I must do” can describe either inner/outer compulsion or a firm claim of duty. The larger narrative pattern (Balak hiring, Balaam speaking, Balak reacting) supports both readings while keeping the central point clear: Balak cannot get the outcome he is paying for.
What this passage clearly contributes
Explicitly, the text shows Balak rejecting both outcomes because either curse or blessing would have public impact (v.25), and it shows Balaam repeating a stated boundary: he will do only what Yahweh speaks (v.26). Theologically by inference, the scene underscores that Yahweh’s word is not for sale and not subject to political control, even when a ruler tries to shut down unfavorable speech. It also highlights the mismatch between Balak’s expectations of a controllable expert and Balaam’s claim to be constrained by Yahweh’s authority (compare Numbers 23:11–12).