Thou hast received in the Lord (parelabes en Kuriōi). Second aorist active indicative of paralambanō, the verb used by Paul of getting his message from the Lord (1Co 15:3). Clearly Archippus had a call “in the Lord” as every preacher should have.
That thou fulfil it (hina autēn plērois). Present active subjunctive of plēroō, “that thou keep on filling it full.” It is a life-time job.