Fælsian

According to the Old English Dictionary:

fælsian

p. ode; pp. od To cleanse, purify; lustrāre :-- Ðæt ic móte Heorot fælsian that I may purify Heorot, Beo. Th. 869; B. 432. He Hróþgáres sele fælsode he had purified Hrothgar's hall, Beo. Th. 4694; B. 2352. DER. ge-fælsian. fælsian