In addition to religious scriptures that survive from the Ming-Qing period, the Qing archives related to the prosecution of secret societies contain references to texts and images found in the possession of members of such societies at the time of their arrest. Texts may also be mentioned or at times quoted in full by the accused in the course of their interrogation. Some of these texts are unknown from other sources and thus the archival material offers precious insights into religious literature used by sectarian groups. This article examines a text that appears in the archives under the title Laojun du fuzi 老君度夫子 (The Elderly Lord Saves the Master), tracing the history of its transmission from the Song dynasty until modern days. In the course of the centuries, the text changed its title and part of its content, to the extent that it may be argued that its versions no longer constitute the same text but rather several interrelated ones, each with its own agenda and socio-cultural background.