Charles Spurgeon Commentary John 9:18

"The Jews therefore did not believe concerning him, that he had been blind, and had received his sight, until they called the parents of him that had received his sight," — John 9:18 (ASV)

But the Jews did not believe concerning him, that he had been blind, and received his sight, until they called the parents of him that had received his sight.

You see, John gives to the Pharisees the name which they arrogated to themselves: "we are Jews." But they were not true Jews. They called themselves Jews, and so John speaks of them as "the Jews." It often happens that a certain clique or party will run away with a name which does not belong to them any more than it does to a great many who differ from them very widely. These Pharisees pretended that they would not believe the miracle. It was manifest before their eyes; but yet they would not believe it until they called his parents.