The earliest in a string of wisdom books ascribed to the sons of Jacob
that came to be referred to collectively as the Testaments of
the Twelve Patriarchs. Fragments of the original Aramaic text of
this work [composed prior to 100 BCE] and the Testament of
Naphtali were found at Qumran.
But the complete corpus of the Testaments has been
preserved only in Greek & Armenian translations.
[Edition used: De Jonge, Marinus et al.
The Testaments of the Twelve Patriarchs: A Critical Edition of the Greek
Text. Leiden: E. J. Brill, 1978.]
Other resources
on line:
Perspective
on the World of Jesus 