John 5:9 describes how, right after Jesus spoke to him, a man who had been disabled for many years was instantly healed, picked up his sleeping mat, and began to walk. This happened on the Sabbath day, which was a day of rest in Jewish tradition.
In this verse, the Gospel writer is telling the story of Jesus healing a man at the pool of Bethesda. The verse highlights both the suddenness of the man’s recovery and the fact that this miracle took place on the Sabbath, a detail that will become important in the following verses as it leads to controversy with the Jewish leaders. The focus is on the completeness of the healing and the immediate change in the man’s life.