The Didache is a brief anonymous early Christian treatise, dated by most modern scholars to the first century. The first line of this treatise is "The teaching of the Lord to the Gentiles (or Nations) by the twelve apostles.
The Didache reveals how Jewish Christians saw themselves and how they adapted their practice for Gentile Christians. The Didache is similar in several ways to the Gospel of Matthew, perhaps because both texts originated in similar communities.
The Didache work was considered by some Church Fathers to be a part of the New Testament, while being rejected by others as spurious or non-canonical. In the end, it was not accepted into the New Testament canon. However, the Ethiopian Orthodox Church "broader canon" includes the Didascalia, a work which draws on the Didache.
Year: 50-120 AD