8 On the day of the attack, David said to his troops, "I hate those 'lame' and 'blind' Jebusites. Whoever attacks them should strike by going into the city through the water tunnel. " That is the origin of the saying, "The blind and the lame may not enter the house."
Matthew Henry's Commentary on 2 Samuel 5:8
Commentary on 2 Samuel 5:6-10
(Read 2 Samuel 5:6-10)
The enemies of God's people are often very confident of their own strength, and most secure when their day to fall draws nigh. But the pride and insolence of the Jebusites animated David, and the Lord God of hosts was with him. Thus in the day of God's power, Satan's strong-hold, the human heart, is changed into a habitation of God through the Spirit, and into a throne on which the Son of David rules, and brings every thought into obedience to himself. May He thus come, and claim, and cleanse, each of our hearts; and, destroying every idol, may he reign there for ever!