Later, when Alma’s little colony joined the Saints in Zarahemla under -Mosiah, Alma was delegated responsibility for the Church. “They did assemble themselves together in different bodies, being called churches; every church having their priests and their teachers, and every priest preaching the word according as it was delivered to him by the mouth of Alma.” Mormon then explained the reason for this system of preaching:
“And thus, notwithstanding there being many churches they were all one church, yea, even the church of God.” (Mosiah 25:21-22; italics added.)
In a modern revelation the Lord spoke concerning the missionary labors of Hyrum Smith and John Murdock:
“And let them journey from thence [from Detroit] preaching the word by the way, saying none other things than that which the prophets and apostles have written, and that which is taught them by the Comforter through the prayer of faith” (D&C 52:9; cf. D&C 52:36).