Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap. For he that soweth to his flesh shall of the flesh reap corruption; but he that soweth to the Spirit shall of the Spirit reap life everlasting. And let us not be weary in well doing: for in due season we shall reap, if we faint not. As we have therefore opportunity, let us do good unto all men, especially unto them who are of the household of faith.
They that sow in tears shall reap in joy. He that goeth forth and weepeth, bearing precious seed, shall doubtless come again with rejoicing, bringing his sheaves with him.
...to him that soweth righteousness shall be a sure reward.
Fear not to do good, my sons, for whatsoever ye sow, that shall also ye reap; therefore, if ye sow good ye shall also reap good for your reward.
-Doctrine & Covenants 6:33