"So, because Jesus was doing these things on the Sabbath, the Jews persecuted him" (John 5:16 NIV).
Jesus defied the Sabbath rules of His day by performing miracles of healing. These miracles were a direct challenge to the rabbinical restrictions.
Here is a list of Jesus' Sabbath miracles of healing. Note that none of the people He healed qualified for the "mortal danger" exception: