Ge-þancian

According to the Old English Dictionary:

ge-þancian

I. to express in words or have in mind feelings of gratitude :-- Efne-geðoncadon congratulabantur, Lk. L. R. 1, 58. Efne-geðoncaiges (geðongias, R.) congratulamini, 15, 6. Efne-geðon-gigas (giðonccigas, R.), 9. II. to express gratitude by action, shew gratitude, reward :-- Rómáne him geþancodon ealles his geswinces mid wyrsan leáne þonne hé tó him geearnod hæfde, Ors. 5, 4; S. 224, 32. [O. H. Ger. ge-dankó] ge-þancian