Isaiah 33:19 promises the removal of the foreign tongue — the opposite of its arrival in 28:11, contrasting judgment with deliverance.

Deuteronomy 28:49 earlier threatens a foreign nation with an unintelligible language — the same judgment Isaiah echoes here.

Jeremiah 5:15 similarly describes a nation whose language you do not know, reinforcing the same prophecy of judgment through foreign tongues.

1 Corinthians 14:21 quotes Isaiah 28:11-12 directly, applying it to the purpose of tongues as a sign for unbelievers.

Acts 2:4 shows Spirit-empowered tongues for evangelism, while 28:11 uses foreign tongues as judgment — a reversal of purpose.