It was "hidden" in the translation of the Gospel of Matthew, which is 1750 years old. The discovery was made using ultraviolet photography of manuscripts in the local library, writes IFLScience.

This gospel was written by a Jew, Matthew the tax-collector ... There are seven narrative sections (1-4, 8-9, 11-2, 14-7, 19-22, 26-8) interspersed with five discourses (5-7, 10, 13, 18, 23-5).