Based on Paul’s behavior in Acts, it may well be he would have told the Jews to continue keeping the Law. He required Timothy be circumcised (16:3) and he had made a vow while in Corinth (18:18). When he is before the Sanhedrin, Paul claims he has continued to keep the law (23:1). This is curious considering the reputation Paul has for preaching a “Law-Free” gospel among the Gentiles. To what extent he kept the boundary markers of the Law these conservatives Jews would have expected from him.
Paul claims to have a “good conscience” in 23:1. The verb Luke uses refers to living as a good citizen (πολιτεύομαι) and is the same work Paul uses in Phil 1:27 for having a “manner of life” worthy of the Gospel. In the Maccabean literature the verb refers to living one’s life in accordance with Jewish traditions (2 Macc 6:1, 11:25; 3 Macc 3:4, 4 Macc 2:8).
4 Macc 2:23“To the mind he gave the law; and one who lives subject to this will rule a kingdom that is temperate, just, good, and courageous.”
Paul therefore claims loyalty to the Law while at the same time evangelizing the Gentiles and teaching them they are not under the Law. It is clear from Paul’s letters he does not advocate freedom from Law as a license to sin, but when people heard Paul teaches a law-free Gospel, they appear to have thought the very worst.
In order to prove to Paul’s detractors that he is stull loyal to the Law, James proposes Paul prove sponsor a Nazarite vow for a few you men (21:22-25). Dunn rightly observes that James does not deny the rumor: “the advice of James and the elders is carefully calibrated. They do not disown the rumors. Instead they suggest that Paul disprove the rumors by his own action, by showing that he himself still lived in observance of the Law” (Dunn, Acts, 287). The fact that James drops out of the story after Paul’s arrest is a mystery – why does James not come to the aid of Paul? No Christians are willing to defend Paul when he goes before the Sanhedrin. Why is this? It seems as though Paul has less support in Jerusalem in A.D. 58 than we might have expected.
Does Paul make a mistake in sponsoring the vow in the Temple? Some people think it would have been unlike Paul to “keep Law” at this point in his career. What is his ultimate motivation for doing this? Does he really need to “prove himself” to be faithful at this late date?