In Helaman 11, Nephi invokes the power of attorney privilege that he was granted in the previous chapter. With war raging among the Nephite people and many dying due to their wickedness, Nephi presents this request to the Lord:
"O Lord, do not suffer that this people should be destroyed by the sword; but O Lord, rather let there be a famine in the land, to stir them up in remembrance of the Lord their God, and perhaps they will repent and turn unto thee." (Helaman 11:4)
As promised, God grants Nephi's request. For the next three years, there is no rain, so the crops don't grow, and there is a great famine throughout the land. Finally, "the people saw that they were about to perish by famine, and they began to remember the Lord their God" (verse 7). When Nephi sees that the people are humbling themselves and turning back to God, he prays for the famine to end. Then, the rain returns and the crops grow, and "the people of Nephi began to prosper again in the land" (verse 20).