Did you mean the foundation of the tongues doctrine? That has to do with God mocking those in unbelief and yet for all that they still refuse to believe. Its not in Webster's but is in the bible. Isiah 28 confirms it as a sign against those who refuse to hear prophecy after the manner of tongues as a fact of not believing God after any manner of prophecy . It is why the sign confirm them in unbelief... yet they still see no evil in creating their own: But we will certainly do whatsoever thing comes out of our own mouth as oral traditions of the fathers .
As for the word that thou hast spoken unto us in the name of the Lord, we will not hearken unto thee. But we will certainly do whatsoever thing goeth forth out of our own mouth, to burn incense unto the queen of heaven, and to pour out drink offerings unto her, as we have done, we, and our fathers, our kings, and our princes, in the cities of Judah, and in the streets of Jerusalem: for then had we plenty of victuals, and were well, and saw no evil.Jerimiah 44:16 17
Stammering lips..
1) mocking, derision, stammering
1a) mocking, derision
1b) stammerings
For with stammering lips and another tongue will he speak to this people. To whom he said, This is the rest wherewith ye may cause the weary to rest; and this is the refreshing: yet they "would not hear".Isaiah 28:11-12
1 Corinthians 14:21-22 King James Version (KJV) In the law (isaiah 28) 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. Wherefore tongues are for a sign, not to them that believe, but to them that believe not: but prophesying serveth not for them that believe not, but for them which believe.
Find the meaning as to what the sign confirms and who it speaks to? Then the rest of the doctrines falls in to place. Or you could say ignore it fall back hoping someone is there to catch. Wouldn't want to be slain in the spirit. .