Joseph, I’m not stripping from him his status as poseik. But if he wrote a book about it, he would state a source in it. I’m asking you to state the source he quotes in his book, if yiddish is an “inyan”, a mitzvah derabbanan, etc, and why. If he doesn’t state it, then the book is meant as “aggadah”, not “halacha”. Rav Dovid Cohen knows what is and is not halacha.
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