Schaff, Philip. History of the Christian Church (The Complete Eight Volumes in One). Amazon Kindle Edition, 2014.
Volume 2, Ante-Nicene Christianity A.D. 100-325, “Chapter 11. The Heresies of the Ante-Nicene Age” Sections 112-136, Loc. 17655-18757.
§ 113. Nazarenes and Ebionites (Elkesaites, Mandaeans).
After a brief bibliography, Schaff observes that Christianity very quickly moved from being primarily Jewish or Gentile to being a Christianity which was neither. However, some Jewish Christian communities remained stronger, especially in Syria (Schaff 2014, Loc. 17708). They tended to keep a very high regard for the Jewish law, but normally did not criticize Gentile Christians. Another group of Jewish Christians, the Ebionites, were a heretical sect (Schaff 2014, Loc. 17714). The name is probably derived from a Hebrew word meaning “poor.” The sect spread widely up to the fourth century. Schaff notes the marks as “degradation of Christianity to the level of Judaism; the principle of the universal and perpetualvalidity of the Mosaic law; and enmity to the apostle Paul” (Schaff 2014, Loc. 17724). One group of Ebionites was rather similar to the Pharisees in their rigorous legalism. Others were more similar to the Gnostics in their outlook (Schaff 2014, Loc. 17736). The various sects had various names. All drew some elements of Judaism into Christianity as requirements. Many also brought in elements of pagan philosophy.