Ge-stefnan

According to the Old English Dictionary:

ge-stefnan

p. de; pp. ed [stefnian to institute] To institute, place, fix; instĭtuĕre :-- Freá engla héht wesan wæter gemǽne, stówe gestefnde the lord of angels bade the waters to be common, and their places fixed, Cd. 8; Th. 10, 21; Gen. 160. ge-stefnan