Stories about Jesus Before the Gospels: Oral Traditions in the Early Church.

The New Testament writings were produced decades after Jesus' death, but long before that people were passing along stories about Jesus and devising poems and creeds about their new-found faith. What do scholars know about these Christian traditions that were being passed along and preserved by word of mouth in the years before we had written texts. Scholars call them "oral traditions." How do we know such things existed, and can we be certain that they were passed along reliably before there were Christian writings?