Let them alone; they are blind guides. And if the blind lead the blind, both will fall into a pit. - Matthew 15:14
A disability.
The angels sent to judge Sodom strike the men of Sodom with blindness
The men of Sodom are offended by Lot's refusal to hand over the angels and press against him. The angels rescued Lot and struck their attackers with blindness so that they wearied themselves groping for the door. (Genesis 19:4-11)
King David takes the stronghold of Zion
After David was anointed king over all Israel, King David and his men went to Jerusalem against the Jebusite inhabitants of the land who said to David, "You will not come in here, but the blind and the lame will ward you off"--thinking, "David cannot come in here." David said, "Whoever would strike the Jebusites, let him get up the water shaft to attack 'the lame and the blind,' who are hated by David's soul," and defeated them. Therefore it is said, "The blind and the lame shall not come into the house." David lived in the stronghold and called it the city of David. And David built the city all around from the Millo inward. And David became greater and greater for the LORD, the God of hosts, was with him. (2 Samuel 5:1-10)
Blind leading the blind
Jesus compares the hypocritical Pharisees who uphold the elders' tradition of washing your hands before you eat before they uphold honoring their fathers and mothers to the blind leading the blind. He tells the disciples to leave them alone and let them fall into their own pit.
Jesus heals crowds of the blind
Jesus walks beside the Sea of Galilee and climbs the mountain to rest. Great crowds came to bring lame, blind, crippled, mute, and others to His feet, and He healed them. They wondered and glorified the God of Israel.
Then Jesus called the disciples to him and said, "I have compassion on the crowd because they have been with me now three days and have nothing to eat. And I am unwilling to send them away hungry, lest they faint on the way.” The disciples said, “Where are we to get enough bread in such a desolate place to feed so great a crowd?” Jesus asked, “How many loaves do you have?” They said, “Seven, and a few small fish.”
Jesus directed the crowd to sit. He took the seven loaves and the fish, and having given thanks he broke them and gave them to the disciples, and the disciples gave them to the crowds. They four thousand men, besides women and children, ate and were satisfied. They took up seven baskets full of the broken pieces left over. And after sending away the crowds, he got into the boat and went to the region of Magadan.