The Mudil Codex from the late 4th century contains the Biblical Psalms in Coptic. However, the text differs significantly from familiar versions of the Psalms, giving rise to the question of whether we are dealing with an original form of the text. The comprehensive analysis presented here demonstrates the tradition in which this fascinating text is located, how it arose, and what significance it has for research into the Psalms generally and the Coptic Bible manuscripts in particular.