Isaiah 33:19
BIB: תִרְאֶ֑ה עַ֣ם עִמְקֵ֤י שָׂפָה֙ מִשְּׁמ֔וֹעַ
NAS: A people of unintelligible speech
KJV: a people of a deeper speech
INT: see A people of unintelligible speech comprehends

Ezekiel 3:5
BIB: אֶל־ עַ֨ם עִמְקֵ֥י שָׂפָ֛ה וְכִבְדֵ֥י
NAS: to a people of unintelligible speech
KJV: to a people of a strange speech
INT: to A people of unintelligible speech difficult

Ezekiel 3:6
BIB: עַמִּ֣ים רַבִּ֗ים עִמְקֵ֤י שָׂפָה֙ וְכִבְדֵ֣י
NAS: peoples of unintelligible speech
KJV: people of a strange speech
INT: peoples to many of unintelligible speech difficult