‏ Galatians 2:4

And that because of false brethren. In the case of Timothy Paul had circumcised him, not as a matter of obligation, or out of deference to the views of Jewish Christians, but so that he could reach unconverted Jews better, who would not listen to a Gentile. See Ac 16:3. The apostles might have recommended the circumcision of Titus, Paul here intimates, not as a matter of duty, but of prudence, had it not been made an issue by the false brethren. He could not yield to such a demand without a sacrifice of principle.

Unawares brought in. These false brethren were really Jews who had slipped into the church.

To spy out our liberty. Really enemies in the guise of friends whose object was to take away the freedom of the gospel, and subject Christians to the bondage of the Jewish law.
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