Near the Sheep Gate in Jerusalem is a pool called Bethesda in Hebrew. It has five colonnades,

At certain times an angel of the Lord would go down into the pool and stir up the water, and whoever stepped in first after the stirring of the water was healed of whatever disease he had.

The sick man answered him, "Sir, I don't have anyone to put me into the pool when the water is stirred up. While I'm trying to get there, someone else steps down ahead of me."

and told him, "Go and wash in the pool of Siloam" (which is translated "Sent One"). So he went off, washed, and came back seeing.