Ge-fægnian

According to the Old English Dictionary:

-fagnian, -fagenian;

ge-fægnian

p. ode; pp. od To rejoice, be glad, exult; gaudēre, exultāre :-- Ic geblissige and ic gefægnige on ðé lætābor et exultābo in te, Ps. Lamb. 9, 3. Geblissiaþ, and gefægniaþ on ðám dagum gaudēte in illa die et exultāte, Lk. Bos. 6, 23. Blissian and gefægnian þeóda lætentur et exultent gentes, Ps. Spl. 66, 4. ge-fægnian