Fyrenian
Bosworth & Toller Anglo-Saxon Old English Dictionary - fyrenian
According to the Old English Dictionary:
fyrnian;
- fyrenian
- p. ede; pp. ed To sin, commit adultery; peccāre, mœchāri :-- Fyrnaþ ðus ðæt flǽschord thus will the body sin, Soul Kmbl. 203; Seel. 103. Ne fyrena ðú non mœchābĕris, Lk. Bos. 18, 20. DER. ge-fyrnian.