The Testimony of Truth is a Gnostic Christian text.[1] It is the third of three treatises in Codex IX of the Nag Hammadi library texts, taking up pages 29–74 of the codex.[2] The original title is unknown; the editor created the title based on expressions in the text, such as "the word of truth" and "true testimony."[3] The text is a homily that argues for accepting spiritual truth and renouncing the material world.[4] The author interprets the serpent that instructed Adam and Eve in the Garden of Eden[5] as Christ, who revealed knowledge of a malevolent Creator.[6] Testimony of Truth is also the only Nag Hammadi text that identifies opposing Gnostic Christian groups by name.[1]