Lehi in the Desert, Nibley, p. 165; Companion to Your Study of the Book of Mormon, Ludlow, p. 309; Moses 6:5-6; Journal of Discourses 2:342
“It is stated in the Book of Ether that Jared and his brother made the request of the Lord that their language be not changed at the time of the confusion of tongues at the Tower of Babel. Their request was granted, and they carried with them the speech of their fathers, the Adamic language, which was powerful even in its written form, so that the things Mahonri wrote ‘were mighty even … unto the overpowering of man to read them.’ That was the kind of language Adam had and this was the language with which Enoch was able to accomplish his mighty work.” (Joseph Fielding Smith, The Way to Perfection, p. 69)