1. kerygma

2. didache

3. liturgy

Didache is a treatise from the first or early second century ad, on Christian morality and practices. The Teaching of the Twelve Apostles.

Like this: did-ache.

Aaron Milavec has written:

'Salvation Is from the Jews'

'The Didache' -- subject(s): Christian ethics, Church, Didache, Early works to 1800, History, History of doctrines

'A pilgrim experiences the world's religions' -- subject(s): Religions, Voyages around the world

Assuming you are referring to the book "Didache" or "The Teaching of the Twelve Apostles", the book is written anonymously, and its date is very disputed. However, there is a tendency to date it quite early because it appears to describe a very primitive church (lacking in much hierarchy or heavy rituals, and having roles such as apostles (missionaries) and prophets, that were not found in 2nd century churches and beyond). Perhaps a date in the late 1st century or early 2nd century would be wise. If so, it puts the Didache up there with I Clement and the Epistle of Barnabbas (perhaps) as among the oldest post-NT Christian documents. Rather than being a name, "Didache" means "doctrine" or "teaching". It shares the root where we get the word "didactic".