ISB ~ Galatians 2 v14

before them all:It is precisely Peter’s authority and influence in the Church that made it necessary for Paul to correct him in public.

to live like Jews:Literally, “to Judaize”, or “to adopt Jewish customs”. Peter’s conduct implied the very thing he had denied at the Jerusalem Council, namely, that Gentile Christians must adopt the ritual laws of Judaism in order to secure their standing in the covenant and obtain salvation (Acts 15:7-11).

• The same expression is used once in the Greek OT, where it describes how Gentiles from Persia were circumcised and Judaized for “fear of the Jews” (Esther 8:17). Here too, in the case of Peter (Gal 2:12) as well as the Judaizers (6:12), fear is once again the driving force behind the impulse to Judaize.