"Fourteen years later I went up again to Jerusalem, this time with Barnabas. I took Titus along also. I went in response to a revelation and set before them the gospel that I preach among the Gentiles. But I did this privately to those who seemed to be leaders, for fear that I was running or had run my race in vain. Yet not even Titus, who was with me, was compelled to be circumcised, even though he was a Greek. This matter arose because some false brothers had infiltrated our ranks to spy on the freedom we have in Christ Jesus and to make us slaves. We did not give in to them for a moment, so that the truth of the gospel might remain with you." (NIV)
This next section is confusing to me. After some time, Paul returned to Jerusalem with Barnabas, who had been traveling with him since the beginning of his ministry, and Titus, a relatively new disciple. I think the fact that Barnabas, who was Mark's cousin (Mark was a disciple of Peter), and Titus were the two Paul took with him is significant. Why? When the Jews wouldn't receive Christ, God sent His apostles to the Gentiles to provoke the Jews to jealousy. When the issue of circumcision and obedience to the Law came up, Titus, a newer believer and a Greek, "was not compelled to be circumcised" (v. 3), even though the book of Titus—Paul's version of the book of James in its focus on the importance of living out one's faith—shows that Paul had been teaching him to not disregard the Law (at least, the parts of it that did not involve sacrifice—after all, the Sacrifice had already been made). But when Peter refused to dine with Gentiles, Barnabas, a long-time Christian and a Jew by birth, gave in and joined Peter in "his hypocrisy" (v. 13).
This passage, Galatians 2:1-10 (although I am only focusing on the first five verses for now), relates to Luke's account in Acts 15. (The commentator on my ESV study Bible believes that it actually relates to Acts 11:29-30, but I find this unlikely. First off, Acts 11:29-30 has Paul and Barnabas bringing famine relief from Antioch to Jerusalem, but Galatians would have it that they went in response to a disagreement, which matches the account in Acts 15:2. In addition, Paul deliberately states that, not only Barnabas, but Titus also was with him; Luke, the author of Acts, makes sure to point out in Acts 15 that "some other believers" went with Paul and Barnabas, while Acts 11:30 indicates that only Paul and Barnabas were present. And the biggest indicator that Acts 15 is the corresponding account, rather than Acts 11:29-30, is the mention of the circumcision group and the link between Galatians 2:3-4 and Acts 15:5.)
Before I go on, I just have to say this:
God is awesome! When I was looking for the passage in Acts that this section in Galatians corresponds with, at first I thought it was Acts 21:17-26. But when I looked it up online, it turned out that it was actually supposed to be Acts 15. (My proof—at least, proof in my mind—is that Luke includes himself among the travelers in Acts 21:17-26, but not in Acts 15; Paul makes no mention of Luke, and I believe that, since he names Luke in Philemon, if Luke had been with him in Galatia, he would have said so.) This distinction between Acts 15 and Acts 21 makes a big difference because Paul says in Galatians 2:5 that they "did not give in... for a moment," but Acts 21:17-26 clearly shows that Paul obeyed the elders. On the other hand, Acts 15:19-21 shows that the apostles agreed to keep parts of the Law that it would be in their best interest to keep (the parts, as stated before, that did not involve making sacrifices): abstinence from "food polluted by idols, from sexual immorality, from the meat of strangled animals and from blood" (Acts 15:20). Now, why did they choose to obey these points in the Law?
Well, avoiding sexual immorality seems pretty obvious; after all, it's
immoral. Man was always intended to only have one wife. That's why Genesis 2:24 says, "For this reason a man will leave his father and mother and be united to his wife, and they will become one flesh." The examples of biblical men with multiple wives (or concubines) shows the truth of the Bible: God isn't afraid to expose man's sinfulness and need for forgiveness.
But why did the apostles agree to abstain from the other three, the potential food items? And why
did Paul participate in the purification rites in Acts 21:26?
God answered this for me using two passages. The first (which actually was added to the answer after the second verse, but this order makes it easier to explain) is Acts 15:21: "For Moses has been preached in every city from the earliest times and is read in the synagogues on every Sabbath." Everyone knew the Mosaic Law. According to Jesus, not a single word of the Law was to be abolished (Matthew 5:17-20). So to appease the Jews, Paul "became like a Jew, to win the Jews" (1 Corinthians 9:20). And that brings me to the second passage, 1 Corinthians 8:4-13; I want to focus on verse 13: "Therefore, if what I eat causes my brother to fall into sin, I will never eat meat again, so that I will not cause him to fall." Paul did not "give in" to believing that the only way to be saved is to obey the Law (Acts 15:1). Instead, he kept the Law so that those who tried to follow the Law could relate to him, making witnessing to them much easier. That's why he met privately with "those who seemed to be leaders": his fear that he "was running or had run [his] race in vain" (v. 2) was not a fear that he had been wrong about the gospel, but that his effort to avoid a division between Jewish and Gentile Christians would fail if he spoke of the matter publicly. But because he was a servant of Christ, not trying to please men (Galatians 1:10), he refused to give in to the circumcision group (whom Paul warns against in his letter to Titus, as a reminder of what was decided at the Jerusalem council) so that the gospel could be maintained in all its truth and in the glory of its message of salvation by grace through faith (Ephesians 2:8-9). As Paul says in Galatians 2:4, "[Some] false brother [have] infiltrated our ranks to spy on the freedom we have in Christ Jesus and to make us slaves." This is war, and we must never surrender. After all, why would you surrender when you've already won?