Galatians 2:4

"Liberty in Christ" has done no injury to innocence.

"And that because of the false brethren, privily brought in." Here arises a very important question, Who were these false brethren? If the Apostles permitted circumcision at Jerusalem, why are those who enjoined it, in accordance with the Apostolic sentence, to be called false brethren? First; because there is a difference between commanding an act to be done, and allowing it after it is done. He who enjoins an act, does it with zeal as necessary, and of primary importance; but he who, without himself commanding it, alloweth another to do it who wishes yields not from a sense of its being necessary but in order to subserve some purpose. We have a similar instance, in Paul's Epistle to the Corinthians, in his command to husbands and wives to come together again. To which, that he might not be thought to be legislating for them, he subjoins, "But this I say by way of permission, not of commandment." (1 Cor. vii: 5.) For this was not a judgment authoritatively given but an indulgence to their incontinence; as he says, "for your incontinency." Would you know Paul's sentence in this matter? hear his words, "I would that all men were even as I myself," (1 Cor. vii: 7.) in continence. And so here, the Apostles made this concession, not as vindicating the law, but as condescending to the infirmities of Judaism. Had they been vindicating the law, they would not have preached to the Jews in one way, and to the Gentiles in another. Had the observance been necessary for unbelievers, then indeed it would plainly have likewise been necessary for all the faithful. But by their decision not to harass the Gentiles on this point, they showed that they permitted it by way of condescension to the Jews. Whereas the purpose of the false brethren was to cast them out of grace, and reduce them under the yoke of slavery again. This is the first difference, and a very wide one. […]

Then when he says, "but because of false brethren, unawares brought in," he shows that he did not change on any other point. This passage is obscure and variant readings are found. It should be read thus: You say that you did not permit Titus …

The preposition 'because of' (dia) was put here instead of 'according to' (kata). But the sense is this. The Apostles, he says, did not force Titus, who was uncircumcised, to be circumcised, although this was pointed out by the brethren who were brought in secretly and pressed for circumcision. Indeed he put them in the place of spies because of what is foreign to the truth.

That they might introduce us again, he says, into the slavery of the law. This is why elsewhere he says, Christ purchased us from the curse of the law (Gal. 3:13).

The order of the speech is as follows: even on account of the false brethren who had come in, Titus was not compelled to be circumcised, that is, although my opponents were present, the apostles did not even for their sake compel Titus to be …

Peter was the apostle to them; and the ceremonial law, though dead with Christ, yet not being as yet buried, he connived at the respect kept up for it. But Paul was the apostle of the Gentiles; and, though he was a Hebrew of the Hebrews, yet he adhered to pure Christianity.

And that because of false brethren,....

This he knew was a doctrine that would be ungrateful to many there, and yet he was not afraid to own it, but in a free and friendly manner lays it open before them and leaves them to judge whether or no it was not the true gospel of Christ.

And that because of false brethren - Who these false brethren were is not certainly known, nor is it known whether he refers to those who were at Jerusalem or to those who were at Antioch. It is probable that he refers to Judaizing Christians, or persons who claimed to be Christians and to have been converted from Judaism. Whether they were dissemblers and hypocrites, or whether they were so imperfectly acquainted with Christianity, and so obstinate, opinionated, and perverse, though really in some respects good men, that they were conscientious in this, it is not easy to determine.

If they had found that we circumcised Titus through fear of the apostles, they would have made that a ground for insisting on imposing the legal yoke on the Gentiles. bring us into bondage--The Greek future implies the certainty and continuance of the bondage as the result.