What did the Judaizers say against Paul wherever he went?
Wherever Paul went, the Judaizers undermined his authority by claiming Peter had spent three years with the Lord, that Peter was their spokesman, and that Peter was the one they would listen to. They set Peter's credentials against Paul's apostleship, suggesting Paul was not the authority to follow.
Les explains that throughout the Corinthian letters Paul is especially defending his apostleship. Every place Paul went, the Judaizers would say, "After all, Peter spent three years with the Lord, and Peter is our spokesman, and Peter is the one that we're going to listen to." This was part of the satanic opposition Paul faced from every direction as soon as he began his ministry among the Gentiles.