M.b.Serapion: The letter of Stoic philosopher Mara bar Serapion to his son, from William Cureton, Spicilegium syriacum, containing remains of Bardesan, Meliton, Ambrose, and Mara bar Serapion, London 1855, syriac text pages 43ff., digital text entered for the Digital Syriac Corpus and typos (both printed source and digital) corrected by CAL staff and compare with IS 80ff.
The original text is often dated prior to Edessan Christianity, but since it refers to the death of the "king of the Jews" has generated huge scholarly interest.