Isaiah 28:11 KJV

For with stammering lips and another tongue will he speak to this people.

The prosperity of Judah; with reproofs for sinfulness and unbeliefThe prophet next turns to Judah, whom he calls the residue of his people. Happy are those alone, who glory in the Lord of hosts himself. Hence his people get...

1 Corinthians 14:21 In the law it is written, With men of other tongues and other lips will I speak unto this people; and yet for all that will they not hear me, saith the Lord.
Deuteronomy 28:49 The LORD shall bring a nation against thee from far, from the end of the earth, as swift as the eagle flieth; a nation whose tongue thou shalt not understand;
Isaiah 33:19 Thou shalt not see a fierce people, a people of a deeper speech than thou canst perceive; of a stammering tongue, that thou canst not understand.
Jeremiah 5:15 Lo, I will bring a nation upon you from far, O house of Israel, saith the LORD: it is a mighty nation, it is an ancient nation, a nation whose language thou knowest not, neither understandest what they say.

From OpenBible.info, most relevant first.

Timeline of the Bible808–698 BC · Isaiah, in the days of Uzziah, Jotham, Ahaz, and Hezekiah

For with stammering כִּי kî Conjunction בְּלַעֲגֵי bĕlaʿăgê לָעֵג Noun · masculine plural construct · with preposition
lips שָׂפָה śāpâ שָׂפָה Noun · feminine singular
and another אַחֶרֶת ʾaḥeret אַחֵר Adjective · feminine singular
tongue וּבְלָשׁוֹן ûbĕlāšôn לָשׁוֹן Noun · masculine or feminine singular · with and, preposition
will he speak יְדַבֵּר yĕdabbēr דָבַר Verb · piel imperfect, third person masculine singular
to this people אֶל ʾel Preposition הָעָם hāʿām עַם Noun · masculine singular · with the הַזֶּה hazzê Pronoun · with the

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