For David had offered that day a reward to whosoever should strike the Jebusites and get up to the gutters of the tops of the houses, and take away the blind and the lame that hated the soul of David: therefore it is said in the proverb: The blind and the lame shall not come into the temple.
Jamieson, Fausset & Brown
Whosoever getteth up to the gutter--This is thought by some to mean a subterranean passage; by others a spout through which water was poured upon the fire which the besiegers often applied to the woodwork at the gateways, and by the projections of which a skilful climber might make his ascent good; a third class render the words, "whosoever dasheth them against the precipice" (Ch1 11:6).
Imported from an open dataset — not yet checked against the printed edition.