Irenaeus' Against Heresies is a very important early witness for the text of the LXX. Irenaeus' quotations from 1 Samuel have survived only in Latin and Armenian translations of this work. In the Latin version, the biblical quotations are translated in the same word-for-word manner as the rest of the text, which makes it a reliable witness for Irenaeus' LXX text. The so-called Lucianic MS group (L) agrees with Irenaeus' quotations in several significant readings, which makes Irenaeus an important witness to the Proto-Lucianic text. This is illustrated by a close analysis of a textual problem in 1 Sam 12:4, where it seems that Irenaeus and L alone have preserved the original form of the text.