Let me ask you only this: Did you receive the Spirit by works of the law or by hearing with faith?
2. This one I wish to learn from you. He now proceeds to support his cause by additional arguments. The first is drawn from their experience, for he reminds them in what manner the gospel was introduced among themselves. When they heard the gospel, they received the Spirit. It was not to the law, therefore, but to faith, that they owed the reception of this benefit.
The apostle is here dealing with those who, having embraced the faith of Christ, still continued to seek for justification by the works of the law; that is, who depended upon their own obedience to the moral precepts as their righteousness before God, and, wherein that was defective, had recourse to the legal sacrifices and purifications to make it up.
Commenting on Galatians 3:1-5
This one thing would I learn of you,.... Though there were many things he could have put to them, yet he would only ask this one question, which, if rightly attended to, and honestly answered, must expose their folly, and put an end to the controversy upon this head: received ye the Spirit by the works of the law, or by the hearing of faith?