Shared ground
The passage presents Saul using a marriage offer as a political tool. On the surface, Saul speaks as though he is honoring David (“I will give you my elder daughter Merab”), but the narrator immediately supplies Saul’s private intent: Saul wants David exposed to lethal danger so that “the Philistines” will kill him rather than Saul killing him directly (explicit textual claim).
David’s reply highlights social distance. He frames becoming the king’s son-in-law as something far above his family’s status (explicit textual claim). The scene ends with a reversal: at the time Merab “should have been given to David,” she is instead given to Adriel (explicit textual claim). The text does not portray this as a minor scheduling issue; it reads as a collapse of what Saul offered.
Where interpretation differs
1) Is Saul’s condition genuine honor or calculated danger?
All readers can see the narrator states Saul’s hidden hope for David’s death. The difference is whether Saul also intended a real reward if David survived. Some read Saul as purely setting a trap, with the marriage offer mainly a baited hook. Others think Saul’s speech still works like an official proposal, but Saul cynically expects David not to live long enough to receive the promise.
2) Why was Merab given to Adriel?
The text reports the outcome but does not explain the mechanism. Some infer Saul deliberately deceived David from the beginning or broke his word once David had served Saul’s purposes. Others think the situation changed for practical or political reasons (for example, timing, shifting alliances), and Saul used the change to keep David at a distance—still consistent with Saul’s hostility.
Why the disagreement exists
The narrator gives Saul’s motive in v.17, but gives no explicit explanation in v.19 for how or why the promised marriage failed. That gap leaves room for different reconstructions of Saul’s intent and the court’s decision-making, while staying within what the text clearly states.
What this passage clearly contributes
This scene intensifies the portrait of Saul as fearful and calculating: he seeks indirect ways to remove David while keeping his own hands “clean” (explicit textual claim). It also shows David being treated as socially “below” the royal household even after military success, and it previews a pattern of Saul’s promises becoming unstable and unreliable. The language about “fighting Yahweh’s battles” ties Israel’s warfare to covenant identity, even while leaders may invoke that language for personal aims (inference grounded in Saul’s stated condition and the narrator’s exposure of his motive).