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The words of the Chasam Sofer in Torahs Moshe:
The speaking of Lashon Hakadash has a benefit that it only stays if one conducts oneself with sanctity because it is a great wonder how in the duration of seventy years lashon hakadash was forgotten and other languages spoken because they did not keep themselves holy, so Yosef gave them a proof on his proper behavior that his constant speaking language was lashon hakadash.
And we can add the fact that he was circumcised.