The Testaments of the Twelve Patriarchs
The instances of the influence of these writings on the New Testament are notable in the Sermon on the Mount which reflects the spirit and even uses phrases from these Testaments. Paul appears to have borrowed so freely that it seems as though he must have carried a copy of the Testaments with him on his travels.
Thus, the reader has before him in these pages what is at once striking for its blunt primitive style and valuable as some of the actual source books of the Bible. ~end excerpt