Unknown inscription, To the Unknown God, Acts 17:23. he that speaketh in an unknown tongue speaketh not unto men, 1Â Cor. 14:2. than ten thousand words in an unknown tongue, 1Â Cor. 14:19. did not do according to their words, offend some unknown being, Alma 30:28. all gone astray after an unknown God, Alma 30:53.