Anything Taught By Gift of Tongues through Relief Society Members Should Not Be Received As Doctrine — Eliza R. Snow (April 28, 1842)
If any have a matter to reveal, let it be in your own tongue. Do not indulge too much in the gift of tongues, or the devil will take advantage of the innocent. You may speak in tongues for your comfort but I lay this down for a rule that if any thing is taught by the gift of tongues, it is not to be received for doctrine.
Nauvoo Relief Society Minute Book, pp. 40-41, The Joseph Smith Papers.