John Lightfoot on Luke 15:11

[A certain man had two sons.] It is no new thing so to apply this parable, as if the elder son denoted the Jew, and the younger the Gentile. And, indeed, the elder son doth suit well enough with the Jew in this, that he boasts so much of his obedience, "I have not transgressed at any time thy commandment": as also, that he is so much against the entertainment of his brother, now a penitent. Nothing can be more grievous to the Jews than the reception of the Gentiles.