What was the mentality of the believing Jews in Jerusalem seven or eight years after Pentecost?
Seven or eight years after Pentecost, their mentality remained strictly law-based. They contended with Peter for entering uncircumcised men's company and eating with them, insisting Gentile food was not kosher and Gentiles were uncircumcised dogs. God had not yet revealed the secret of grace going to the Gentiles, so He was still dealing with Israel under the law.
Les explains that when Peter went up to Jerusalem, the believing Jews of the circumcision contended with him, arguing that he had gone into uncircumcised men and eaten with them. Their mentality was still law: you cannot eat Gentile food because it is not kosher; you cannot visit Gentiles; they are uncircumcised dogs. Les says this was still the mentality of the believers in Jerusalem seven or eight years after Pentecost because God had not yet revealed the secret of grace going to the Gentiles. Instead, He was still dealing with the nation of Israel under the law. Les also points to Ananias as a devout man after the law, showing that even he was a law-keeping Jew.