Doctrine and Covenants 52:9-10

9 And let them journey from thence 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.
10 Let them go two by two, and thus let them preach by the way in every congregation, baptizing by water, and the laying on of the hands by the water’s side