Fyrnian
Bosworth & Toller Anglo-Saxon Old English Dictionary - fyrnian
According to the Old English Dictionary:
he fyrnaþ;
- fyrnian
- p. ede; pp. ed To revile; calumniāri :-- Fyrnaþ ðus ðæt flǽschord thus, it [the soul] shall revile the flesh, Soul Kmbl. 203; Seel. 103.