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https://www.logos.com/product/53342/five-books-of-st-irenaeus-against-heresies
Book Description on the webpage:
Open a window onto the Gnostic controversy facing the church in the second century with one of the only surviving sources on the subject. This, the most important work of St. Irenaeus, examines and refutes the Gnostic teachings, providing a valuable description of Gnosticism as well as an important Christian theological work.
Bishop of Lyon and a disciple of Polycarp, Irenaeus wrote Against Heresies in order to “shortly and clearly set forth the meaning of those who are now teaching amiss, I mean of Ptolemy and his partisans, which school is a kind of efflorescence from that of Valentinus . . . showing how monstrous their assertions are, and how inconsistent with the Truth.” This five-volume work is an important piece of patristic writing for anyone studying church history, Gnosticism, and the development of Christian theology