Isaiah 28:11 uses the same 'stammering lips and another tongue' to describe God's judgment through foreigners, directly echoing Isaiah 33:19.

Deuteronomy 28:49 warns of a nation with an unintelligible language — the same description used here for the Assyrian invaders.

Deuteronomy 28:50 describes a fierce nation with strange speech as a covenant curse, paralleling the same foreign threat imagery in Isaiah 33:19.

Jeremiah 5:15 warns of a nation from far with an unknown tongue, closely paralleling Isaiah 33:19's depiction of a foreign, unintelligible people.

Ezekiel 3:5 contrasts Ezekiel's mission: he is not sent to a people of strange speech, unlike the foreign nation in Isaiah 33:19.

Ezekiel 3:6 further contrasts: foreign-speaking people would have listened, but Israel did not—opposite to the unhearing foreign nation in Isaiah 33:19.