A-hérian

According to the Old English Dictionary:

a-hérian

p. ede; pp. ed To praise fully, celebrate enough; plene laudare, satis celebrare :-- Ne mæg ðé ahérian hæleða ǽnig not any men can fully praise thee, Hy. 3, 10; Hy. Grn. ii. 281, 10; prec. 3 ad calcem Cœdm. l. 5. a-herian