His parents answered ... - To the first two questions they answered without hesitation. They knew that he was their son, and that he was born blind. The third question they could not positively answer, as they had not witnessed the means of the cure, and were afraid to express their belief. It appears that they had themselves no doubt, but they were not eye-witnesses, and could not be therefore legal evidence.

He is of age - He is of sufficient age to give testimony. Among the Jews this age was fixed at thirteen years.

If any man did confess that he was Christ - Did acknowledge that he was the Messiah. They had prejudged the case, and were determined to put down all free inquiry, and not to be convinced by any means.

Put out of the synagogue - This took place in the temple, or near the temple. It does not refer, therefore, to any immediate and violent putting forth from the place where they were. It refers to excommunication from the synagogue. Among the Jews there were two grades of excommunication; the one for lighter offences, of which they mentioned 24 causes; the other for greater offences. The first excluded a man for 30 days from the privilege of entering a synagogue, and from coming nearer to his wife or friends than 4 cubits. The other was a solemn exclusion forever from the worship of the synagogue, attended with awful maledictions and curses, and an exclusion from all contact with the people. This was called the curse, and so thoroughly excluded the person from all communion whatever with his countrymen, that they were not allowed to sell to him anything, even the necessaries of life (Buxtorf). It is probable that this latter punishment was what they intended to inflict if anyone should confess that Jesus was the Messiah: and it was the fear of this terrible punishment that deterred his parents from expressing their opinion.

His parents answered them, and said,.... What follows, which contains distinct answers to the several questions: and to the first they reply very freely, and with great confidence,

we know that this is our son; for though his receiving his sight made a considerable alteration in him, yet his features were the same; and there might be some marks in his body, which they were acquainted with, by which they knew assuredly he was their son: and if even the neighbours, though they disagreed about him, yet some of them knew him to be the same person that had been blind and begged, then much more his parents; and even those who said it was not he, yet they owned he was like him: and with respect to the second question they answer,

and that he was born blind: this they were ready to attest, and did attest.

His parents answered them and said, We know that this is our son, and that he was born blind:

9:18-23 The Pharisees vainly hoped to disprove this notable miracle. They expected a Messiah, but could not bear to think that this Jesus should be he, because his precepts were all contrary to their traditions, and because they expected a Messiah in outward pomp and splendour. The fear of man brings a snare, Pr 29:25, and often makes people deny and disown Christ and his truths and ways, and act against their consciences. The unlearned and poor, who are simple-hearted, readily draw proper inferences from the evidences of the light of the gospel; but those whose desires are another way, though ever learning, never come to the knowledge of the truth.