Alma 12:21 And it came to pass when they had arrived in the borders of the land of the Lamanites, that they separated themselves, and departed one from another, trusting in the Lord, that they should meet again at the close of their harvest: for they supposed that great was the work which they had undertaken.
Alma 12:22 And assuredly it was great, for they had undertaken to preach the word of God to a wild, and a hardened, and a ferocious people; a people who delighted in murdering the Nephites, and robbing, and plundering them;
Alma 12:26 Therefore this was the cause for which the sons of Mosiah had undertaken the work, that perhaps they might bring them unto repentance; that perhaps they might bring them to know of the plan of redemption:
Alma 21:62 And it came to pass that when Amalickiah saw that the people of Moroni were more numerous than the Amalickiahites; and he also saw that his people were doubtful concerning the justice of the cause in which they had undertaken; therefore, fearing that he should not gain the point, he took those of his people who would, and departed into the land of Nephi.
DC 7:2b I say unto thee, Peter, this was a good desire, but my beloved has desired that he might do more, or a greater work yet among men, than what he has before done; yea, he has undertaken a greater work;
DC 125:12a The missions abroad other than those in the land of Joseph which were opened officially during the lifetime of the martyrs shall be considered as having been opened unto us, whether they were at once undertaken and prosecuted during the lifetime of the martyrs, or whether subsequent to their death they were prosecuted in righteousness-wherever they were sent.