Tó-samnian

According to the Old English Dictionary:

tó-samnian

p. ode To assemble, collect:--Ðá bæd hé hine ðæt hé sumne dǽl landes æt him onfénge, ðæt hé mihte mynster on getimbrian and Godes ðeówas tósomnian he prayed him to receive from him a parcel of land, that he might thereon build a monastery and collect together servants of God, Bd. 3, 23; S. 554, 11. to-samnian