Paul's letter written to combat heresy of the Judaizers is:

Galatians

Romans

Corinthians

Thessalonians

For the answer to the question above, Paul's letter written to combat heresy of the Judaizers is written in the book of Galatians. Judaizers are People who pray out to public loud and sound like professional in praying but their hearts are empty and away from the Lord.

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Paul's letter written to combat heresy of the Judaizers is:

Galatians