This article analyses the text of the Introduction to the Gospels written by Theophylact of Bulgaria which is included into the Gospel from Peresopnitsa (Peresopnitskoye Evangeliye). The Introduction to the Gospel of Mathew included in the Peresopnitskoye Evangeliye correlates with the second version of the introduction in Church Slavonic. The introductions to the other three Gospels are translated into Ruthenian language (prosta mova). The author pays special attention to the translation of the quotes from the Gospels used by Theophylact of Bulgaria. The analysis of these quotes allows specify the range of possible sources for this manuscript. In particular the Athos version of the New Testament and West Slavic editions of the Bible were used in the translation.