Sangitisutta 3.2.67

3.2.67

majjhimesu janapadesu paccājāto hoti. So ca hoti duppañño jaḷo eḷamūgo, nappaṭibalo subhāsitadubbhāsitānamatthamaññātuṃ.

And an individual is reborn in a central country. But they’re witless, dull, idiotic, and unable to distinguish what is well said from what is poorly said.