Shared ground
These verses present a sharp contrast between what the Jebusites say and what actually happens. They speak with confidence that David will not get in, and they use the phrase “the blind and the lame” to mock him or the attempt itself. The narrator then directly states what they were thinking: David cannot enter.
The next line reverses that expectation. David captures “the stronghold of Zion,” and the text links that captured fortress with “the city of David.” Explicitly, the passage is about the fall of a fortified site and its new association with David’s rule.
Where interpretation differs
Two main details invite more than one reasonable reading.
First, what does “the blind and the lame” mean in the taunt? Some take it as purely figurative language: the defenders are saying, in effect, “we could stop you with the weakest people imaginable,” meaning the city is secure. Others think it may refer to specific groups, statues, or a stock saying tied to the city’s defenses; the narrative does not explain the phrase beyond reporting the Jebusites’ confidence.
Second, what exactly is “the stronghold of Zion,” and how does it relate to “the city of David”? Some read “stronghold” as the fortress/citadel within Jerusalem, with “city of David” referring to that royal fortified area. Others treat the terms more broadly as a way of naming Jerusalem as David’s new capital, even if the immediate reference is the fortified core.
Why the disagreement exists
The text reports the taunt but does not spell out its background, and the phrase “blind and lame” can function as either an insult or a literal reference. Likewise, “stronghold,” “Zion,” and “city of David” can name overlapping spaces (fortress, hill, city) depending on how tightly one thinks the author is speaking.
What this passage clearly contributes
At a narrative level, the passage highlights reversal: confident defenders are wrong, and David succeeds anyway. Politically and theologically (by inference from the story’s emphasis), it frames David’s reign as quickly establishing a secure center, with Zion/Jerusalem becoming identified with David’s kingship (compare the later importance of Zion in Israel’s story, e.g., Psalm 48:1). The explicit claim remains: David takes the stronghold, and it becomes “the city of David.”