What is the meaning of 1 Corinthians 14:21?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

It is written in the Law: “By strange tongues and foreign lips I will speak to this people, but even then they will not listen to Me, says the Lord.”

Berean Standard Bible (BSB)

In the law it is written, “By men of strange languages and by the lips of strangers I will speak to this people. Not even thus will they hear me, says the Lord.”

World English Bible (WEB)

In{G1722} the law{G3551} it is written{G1125}{(G5769)},{G3754} With{G1722} men of other tongues{G2084} and{G2532} other{G1722}{G2087} lips{G5491} will I speak{G2980}{(G5692)} unto this{G5129} people{G2992}; and{G2532} yet for all{G3779} that will they{G1522} not{G3761} hear{G1522}{(G5695)} me{G3450}, saith{G3004}{(G5719)} the Lord{G2962}.

Strong's King James

In the Torah it's written that, "IN FOREIGN TONGUES AND IN THE LIPS OF ANOTHER, I WILL SPEAK TO THIS PEOPLE, NOT EVEN SO, WILL THEY LISTEN TO ME," says יהוה YAHWEH.

The F.O.G*

[21] In the Law, יהוה says: "Through people speaking foreign languages I will speak to this people, but even then, they won't listen to Me." This was prophecy about spiritual stubbornness.

The F.O.G Paraphrase

in the law it hath been written, that, ‘With other tongues and with other lips I will speak to this people, and not even so will they hear Me, saith the Lord;’

Young's Literal Translation