Didache or the Teaching/Twelve Apostles

The Didache also known as The Teaching of the Twelve Apostles, 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 text, parts of which constitute the oldest extant written catechism, has three main sections dealing with Christian ethics, rituals such as baptism and Eucharist, and Church organization.