4. List the four undisputed apostolic fathers and indicate which of their writings now are extant.

Didache—Not rediscovered until the nineteenth century, this handbook of moral instruction and liturgical practice is also known as the "Teaching of the Twelve" (Apostles). More in the Jewish-Christian tradition than the other works in the collection, it emphasizes ethical behavior, proper worship and ceremonial practices, and also gives instructions about discerning false prophets, hoping that itinerant true prophets will settle in local churches perhaps to serve as bishops.

Epistle of Polycarp—A letter from Polycarp, the bishop of Smryna and future martyr, to the Philippian church, which many scholars believe to be a cover-letter sent with Polycarp's collection of the letters of Ignatius, although it deals primarily with other subjects, such as praise for the Apostle Paul and an exhortation against heresy.

Epistle of Barnabas—Also called Pseudo-Barnabas, this is an anonymous treatise or sermon attributed to Paul's companion Barnabas, somewhat in the tradition of the Epistle to the Hebrews. It warns Christians to avoid Judaistic attitudes, but goes further than Hebrews by affirming that God's covenant belongs to Christians alone, and was never in fact received by the Jews.

CLEMENT OF ROME
The first Epistle, bearing the name of Clement, has been preserved to us in a single manuscript only. Though very frequently referred to by ancient Christian writers, it remained unknown to the scholars of Western Europe until happily discovered in the Alexandrian manuscript. This ms. of the Sacred Scriptures (known and generally referred to as Codex A) was presented in 1628 by Cyril, Patriarch of Constantinople, to Charles I., and is now preserved in the British Museum. Subjoined to the books of the New Testament contained in it, there are two writings described as the Epistles of one Clement. Of these, that now before us is the first. It is tolerably perfect, but there are many slight lacunae, or gaps, in the ms., and one whole leaf is supposed to have been lost towards the close. These lacunae, however, so numerous in some chapters, do not generally extend beyond a word or syllable, and can for the most part be easily supplied.