Shared ground
These verses continue the capture of Zion by moving from the moment of attack (v. 8) to the securing of the city (vv. 9–10). The text presents David as giving a concrete battlefield order that involves a “watercourse” route and language about “the blind and the lame.” It also reports that this wording became tied to a saying or taunt about David not being able to “come into the house.”
After the stronghold is taken, David makes it his residence, renames it “the city of David,” and strengthens it with building work “from Millo and inward” (v. 9). The narrator then summarizes David’s rising power and explains it in theological terms: Yahweh (called “the God of hosts”) is with him (v. 10). 2 Samuel 5:8–10
Where interpretation differs
Two main questions are genuinely unclear in v. 8.
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What “watercourse” refers to. Some understand it as a specific physical access point (like a shaft, channel, or tunnel) used to breach the defenses. Others take it more generally as reaching the city’s water system or a drainage route used in the assault.
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Who “the blind and the lame” are. Many read the phrase as a contemptuous label for the Jebusite defenders (echoing their earlier taunt that David could not take the city). Others argue it may refer to non-human “defenders” such as idols, or to some symbolic language tied to the taunt and the city’s supposed invincibility.
Why the disagreement exists
The verse mixes (a) a command, (b) an explanatory note about David’s hostility, and (c) a proverb-like saying about “the blind and the lame” and “the house.” The quick shifts make it hard to tell whether the phrase describes actual people on the wall, a mocking slogan, or something more figurative. Also, both “watercourse” and “Millo” name real features, but the text does not define them, leaving readers to infer details from geography and later references.
What this passage clearly contributes
Explicitly, the passage portrays conquest followed by consolidation: David’s forces take the stronghold, David moves in and renames it, and fortification work begins (textual claims about command, occupation, naming, and building). Theologically (an inference grounded in v. 10’s explanation), David’s success is not presented as mere strategy or momentum; the narrator attributes his growing dominance to Yahweh’s ongoing presence with him, using the title “God of hosts” to frame David’s rise within the reality of divine power over armies and history.