What should I do with a fiancé who quotes authentic hadiths and recites them in colloquial Arabic?

The Friday sermon must be delivered in Classical Arabic, avoiding colloquial and vulgar expressions. This is especially emphasized when reciting the Prophetic hadiths.

If there is a need to clarify the meaning for those who do not understand Classical Arabic, there is no harm in explaining and elaborating on the meaning in the dialect they comprehend.

However, the hadith itself should not be recited in a colloquial dialect. But there is no harm in explaining other matters in a colloquial dialect.

Whoever recites a hadith must have knowledge of Classical Arabic to avoid errors and mistakes in the hadiths.

Some scholars have recommended reciting the hadith with tajweed (elocution), just as the Quran is recited with tajweed, because tajweed is among the beauties of speech, the language of the Arabs, and the eloquence of the speaker.