Where does God warn about the Jews?

“For you are all sons and daughters of God through faith in Christ Jesus. For all of you who were baptized into Christ have clothed yourselves with Christ. There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus.” Galatians‬ ‭3‬:‭26‬-‭29‬ ‭

Not about Jew or Greek. All about Jesus.