Ge-warnian

According to the Old English Dictionary:

ge-warnian

p. ode; pp. od To warn :-- God on swefne hí gewarnode God warned them in a dream, Homl. Th. i. 78, 29. Ðá gewarnode man hí ðæt ðǽr wæs fyrd æt Lundene then they had notice that there was a force at London, Chr. 1009; Erl. 143, 12. Ðá wearþ Godwine gewarnod then was earl Godwin warned, 1052; Erl. 183, 2. Gebeorh gewarnian tuitionem præstare, Bd. 2, 5; S. 506, 30, note. ge-warnian