Undertaken a great work

1. Alma 17: 13-14, 16
   
   

     13 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.
   
   

     14 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; and their hearts were set upon riches, or upon gold and silver, and precious stones; yet they sought to obtain these things by murdering and plundering, that they might not labor for them with their own hands.
   16 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. 
2. D&C 7: 6
   
   

     6 Yea, he has undertaken a greater work; therefore I will make him as flaming fire and a ministering angel; he shall minister for those who shall be heirs of salvation who dwell on the earth.