For the source text click/tap here: Kiddushin 68
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The Gemora had cited the verse You shall not make marriage with them as the source which teaches us that kiddushin does not take effect with a gentile.
The Gemora asks: But that verse is discussing the Seven Nations of Canaan. How do we know that kiddushin does not take effect with members of the other nations? The Gemora answers: It is written (with respect to marrying them): For he will turn your son away. This would include all those who would turn the Jewish people away from Hashem.
We explore the halachot of marrying out or extra marital relations.