2 Samuel 5:8

And David said on that day, while preparing to storm the fortress, Whosoever getteth up to the gutter and smiteth the Jebusites and the lame and the blind, that are hated of David's soul, he shall be chief and captain, 1 Chronicles 11:6. The difficult passage is best rendered: Every one who conquers the Jebusites, let him cast into the waterfall both the lame and the blind, hated of David's soul. The expression "blind and lame" applied to all the Jebusites, and the order to throw the slain down the declivity was given in order to gain space for the hand-to-hand encounter in the fortress. Wherefore they said, it became a proverbial saying, The blind and the lame, undesirable people like the Jebusites, shall not come in to the house.