What did Peter do after the Jewish people came from Jerusalem?
After the Jewish people came from Jerusalem, Peter became afraid of them and gave in. He withdrew and separated himself from Paul's Gentile converts, refusing to eat with them. He acted two-faced, eating with Gentiles before but pulling back once the Jerusalem emissaries arrived, fearing the men from Jerusalem rather than God.
Les explains that before certain men came from James, Peter ate with Paul and the Gentile believers regardless of the meal. But after these Jewish people came up from Jerusalem, Peter was scared and afraid of them. Rather than maintain the testimony of Paul's Gospel of Grace and prove that believers are free to eat whatever they want, no longer under dietary laws, Peter gave in. He refused to go in and eat with Paul's Gentile converts. Paul got upset and called him two-faced: when nobody from Jerusalem was there, Peter had no problem eating with the Gentiles, but as soon as those people came, he said he was a good Jew and could not do that. Paul called him on it, saying Peter withdrew and separated himself from the Gentiles, fearing not God but the men from Jerusalem.
For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision.