John Calvin on John 12:9

9. Then a great multitude of the Jews knew that he was there. The more nearly the time of the death of Christ approached, it became the more necessary that his name should be universally celebrated, in order that it might be a preparation for stronger faith after his death. More especially, the Evangelist relates that the recent miracle of the resurrection of Lazarus had acquired great celebrity: and as Christ showed in it a remarkable proof of his Divinity, God intended that it should have many witnesses. When he says that they came not on account of Jesus only, but also for the sake of Lazarus, he does not mean that they came out of regard to Lazarus, as if they bestowed this mark of honor on him in particular, but that they might behold the astonishing display of the power of Christ in Lazarus.