Now send word quickly to David and warn him, ¹  “Don’t spend the night at the fords of the desert ²  tonight. Instead, be sure you cross over, ³  or else the king and everyone who is with him may be overwhelmed.” ⁴ 

David said on that day, “Whoever attacks the Jebusites must approach the ‘lame’ and the ‘blind’ who are David’s enemies ¹  by going through the water tunnel.” ²  For this reason it is said, “The blind and the lame cannot enter the palace.” ³