How so?
First century Jews hated Gentiles. They considered Gentiles to be lower than dogs. They would not eat or associate with Gentiles. Possibly from two main factors. They knew from scriptures that Jews were Gods elect among the nations. They also had experience with being taken into captivity by Gentiles and being treated very harshly.
For the cause of Christ
Roger
We're talking about Corinthians. Do you think they may have been a mixture of saved jews and saved gentiles present at the Corinth gathering? I mean paul himself was a saved jew. And he traveled at times with a saved gentile.