Galatians 2:18

For if I build again the things which I destroyed,.... Which must be understood not of good things, for formerly he destroyed the faith of the Gospel, at least as much as in him lay, and now he built it up, established, and defended it; in doing which he did no evil, or made himself a transgressor, but the reverse; he showed himself a faithful minister of Christ: but of things not lawful, such as the rites and ceremonies of the law of Moses, which were now abrogated, and he had declared to be so all over the Gentile world; and therefore should he go about to establish these things as necessary to salvation, or teach men to join the observance of them with Christ's righteousness for justification, then, says he,I make myself a transgressor: for he could not be otherwise, be the case how it would with respect to the abrogation, or non-abrogation of the law; for if the law was not abolished, then he made himself a transgressor of it; by neglecting it himself, and teaching others to do so; and if it was abolished, then it must be criminal in him to enforce the observance of it as necessary to a sinner's justification before God.