John 5:17 "But Jesus answered them, 'My Father is working still, and I am working.'" 
This is in response to the Jews criticizing him for healing a man on the Sabbath, implying that he was breaking the Sabbath law by working. 
Jesus' statement emphasizes that his Father, God, is always working, and therefore, he, as the Son of God, is also working, even on the Sabbath.