"For an angel went down at a certain season into the pool, and troubled the water: whosoever then first after the troubling of the water stepped in was made whole of whatsoever disease he had" (John 5:2-4).
This account gives us a picture of God's sovereign side. Five sheds full of people sat by that pool. The people didn't know when the angel was coming; they just knew he was coming. They didn't know who would be healed; they just knew someone would be healed. And afterwards, the rest of the people would have to sit and wait for the next time the angel came to trouble the water.