READING ACTS: Abraham’s Faith and Works in Romans 4. Phil Long interacts with a number of ancient Jewish texts here, including Ben Sira, the Mishnah, 1 Maccabees, and Philo. I have reservations about the use of the Testament of Abraham as a Jewish text. I'm not sure what it is, but reading it simply as Jewish (or Christian) leaves problems unsolved. See my book, The Provenance of the Pseudepigrapha, pp. 199-206 for details.
See this post as well: By Faith not Circumcision – Romans 4:9-12, which deals with an important theme in ancient Judaism (and thereafter).
Some of Phil Long's past posts on Paul's Letter to the Romans are noted, with comments, here and links.