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The Testaments of the Twelve Patriarchs 

The apocryphal work known as the Testaments of the Twelve Patriarchs professes to be, as its name implies, the utterances of the dying patriarchs, the sons of Jacob. In these they give some account of their lives, embodying particulars not found in the scriptural account, and build thereupon various moral precepts for the guidance of their descendants. The book partakes also of the nature of an Apocalypse: the patriarchs see in the future their children doing wickedly, stained with the sins of every nation; and thus they foretell the troubles impending on their race. Still at last God will put an end to their woe, and comfort is found in the promise of a Messiah.

There can be little or no doubt that the author was a Jew, who, having been converted to Christianity, sought to win over his countrymen to the same faith, and thus employed the names of the patriarchs as a vehicle for conveying instruction to their descendants, as winning by this means for his teaching at any rate a prima facie welcome in the eyes of the Jewish people.