What are some good sources on the Gospel of John as a source for First-Century Judaism? During the 1950s and 1960s, the Fourth Gospel was often associated with Judaism. Scholars of that era would examine diverse thought types in rabbinic texts and Hellenistic Jewish works. How do scholars of this era do this type of study? The author of John is particularly fascinated with Judaism. John uses no other textual source material than the Hebrew Bible and demonstrates a commendable familiarity with Jerusalem, Jewish festivals. The Gospel is so Jewish that it serves as the earliest textual source for Jewish concepts. What are some good searches to begin my study?