What is Early Christian?Early Christianity, the period of Christianity preceding the First Council of Nicaea in 325 AD. This typically divides historically into the Apostolic Age and the Ante-Nicene Period (from the Apostolic Age until Nicea). The first Christians, as described in the first chapters of the Book of Acts, were all Jews either by birth or conversion and historians refer to them as Jewish Christians. The early Gospel message spread orally, probably originally in Aramaic, and later in Greek. The New Testament's Acts of the Apostles and Epistle to the Galatians record that the first Christian community centered on Jerusalem and that its leaders included Peter, James, the brother of Jesus, and John the Apostle.
What is Old Testament?The Old Testament (OT) is the first part of Christian Bibles. This is based primarily upon the Hebrew Bible (or Tanakh), a collection of ancient religious writings by the Israelites believed by most Christians and religious Jews to be the sacred Word of God. The second part of the Christian Bible is the New Testament.
The books that comprise the Old Testament canon, as well as their order and names, differ between Christian denominations. The Catholic canon comprises 46 books, and the canons of the Eastern Orthodox and Oriental Orthodox Churches comprise up to 51 books and the most common Protestant canon comprises 39 books.