Ebionite Christians had an early copy of the Gospel of Matthew; they did not have the two first chapters (including the virgin birth), which were added by later Christians. They strongly believed that all the Old Testament Jewish Laws had to be obeyed; including the Sabbath and circumcision for all males. As such, they considered St Paul to be the archenemy of Christianity as he taught that people did not have to obey the Law in order to be saved. Pauline Christians eradicated the Ebionites, burnt all their books (none survived), and wrote volumes and volumes against them.
"If we were to guess which group was the more austere, holy and godly, we would have to guess it was the Ebionites rather than the Pauline Christians who slaughtered, slandered and oppressed them. Unfortunately the victors get to write history, and it is Pauline Christianity that became the legacy of the Roman Empire. After the fourth century, the Ebionites were vanquished."