The Book of Gad the Seer (Hebrew: דברי גד החזה, romanized: diḇrê Gāḏ ha-ḥōzeh) is a presumed lost text, supposed to have been written by the biblical prophet Gad, which is mentioned at 1 Chronicles (1 Chronicles 29:29).
[1] There is a pseudepigraphic book by the same title, extant in the form of a manuscript from the Black Jews of Cochin, India.
According to Solomon Schechter, this manuscript was copied from a document purporting to be from Rome, and the late linguistic forms and features of the Hebrew manuscript, as well as its substantial similarity with some medieval Kabbalistic literature and some aspects of Christianity, indicate a relatively late date.
[2] However, according to Professor Meir Bar Ilan, although some linguistic aspects of the Hebrew manuscript are of late date, there is evidence that the book originated in approximately the 1st or 2nd century A.D.[3][4][5] A scholarly edition of the book was published in August 2015, edited by Professor Meir Bar Ilan of Bar Ilan University.
[6] The work is included in the contemporary The 120-Book Holy Bible and Apocrypha Collection: Literal Standard Version (LSV).