“Zenock and Also Ezias”

"Zenock was…a prophet of Israel of whose personal history, or to what age he belonged, we know nothing. His writings were familiar to the Nephites as he is quoted by Nephi (I Nephi 19:10); Alma (Alma 33:15); Amulek (Alma 34:7); and Mormon (III Nephi 10:16).

“Ezias was also a Hebrew prophet, referred to by Nephi (Helaman 8:19). Elder Orson Pratt suggests that ’Ezias may have been identical with Esaias, who lived contemporary with Abraham.’ (See Doctrine and Covenants 84:11–13.)” (Reynolds and Sjodahl, Commentary on the Book of Mormon, vol. 5, p. 270)