Jesus then continued his ministry in Jerusalem. In the area is a Sheep Gate, with sick, blind, and injured people near the water (likely to be healed). John 5:4 had an interesting comment on how an "angel" stirred the waters to instigate healing -- some translations like NKJV have it, while others like NIV tossed it out (and NKJV commented on how 5:4 is not in NU). Michael Heiser noted cues like untypical phrasing and asterisks that explained why some translators knew that the section may not be in the original writings, and he explained that John likely wanted to put more emphasis on Jesus than any random thought on angels (Bible Study Magazine).
But moving on, one man had a medical problem for 38 years. Jesus went on to heal the man, but notice how Jesus took time to interact before doing the healing. He asked the man if he wants to be made well and listened to the man's condition on how no one would put him into the pool (5:6-7). Eventually, he called the man to get up and walk, and the man got healed (5:8-9). Acts of service can not only involve actions but also interactions.
It's worth noting that in the healing process, Jesus broke conventions. Healing is (possibly) described as getting into a pool, but when Jesus healed the man, he did not use the pool in any way, shape, or form. He demonstrated that God works outside of traditional norms, so it's worth having an open mind on what God can do. But more importantly, Jesus healed and called the man to carry the bed -- on the Sabbath (5:9). The day where the Jewish authorities supervised to make sure no one is doing work. Thomas Constable noted that the point of Sabbath is for people to not do work as in job (Study Light), and carrying the bed is not meant to be part of a career (it's likely a one-time deal). Jesus likely did so to confront the excessive legalism that the Jewish leadership instituted, and in the next few verses, that would instigate conflict.