Jewish Christians, also Hebrew Christians or Judeo-Christians, were the original members of the Jewish movement that later became Christianity. In the earliest stage the community was made up of all those Jews who accepted Jesus as a venerable person or the Messiah (Christ). As Christianity grew and developed, Jewish Christians became only one strand of the early Christian community, characterised by combining the confession of Jesus as Christ with continued adherence to Jewish traditions such as Sabbath observance, observance of the Jewish calendar, observance of Jewish laws and customs, circumcision, and synagogue attendance, and by a direct genetic relationship to the earliest Jewish Christians.
The term "Jewish Christian" appears in historical texts contrasting Christians of Jewish origin with Gentile Christians, both in discussion of the New Testament church and the second and following centuries. It is also a term used for Jews who converted to Christianity but kept their Jewish heritage and traditions.
1st century "Jewish Christians" were faithful religious Jews. They differed from other contemporary Jews only in their acceptance of Jesus as the Messiah. Those that taught that Gentile converts to Christianity ought to adopt more Jewish practices than the Church had already included, however, were called "Judaizers". Though the Apostle Peter was initially sympathetic, the Apostle Paul opposed the teaching at the Incident at Antioch (Gal. 2:11-21) and at the Council of Jerusalem (Acts 15:6-35), where Paul's teaching was accepted by the whole Church. Nevertheless, Judaizing continued for several centuries, particularly among Jewish Christians.