Epistle

Saint Paul Writing His Epistles, by Valentin de Boulogne or Nicolas Tournier (c. 16th century, Blaffer Foundation Collection, Houston, TX).

An epistle (/ɪˈpɪsəl/; from Ancient Greek ἐπιστολή (epistolḗ) 'letter') is a writing directed or sent to a person or group of people, usually an elegant and formal didactic letter. The epistle genre of letter-writing was common in ancient Egypt as part of the scribal-school writing curriculum. The letters in the New Testament written by apostles to the early Christians are usually referred to as epistles; those traditionally attributed to Paul are known as Pauline epistles and the others as catholic (i.e., "general") epistles.