The image of sowing and reaping appears in Galatians 6, in 2 Corinthians 9, and in the Book of Job.
In Galatians 6:7:
7 Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap.
6 But this I say, He which soweth sparingly shall reap also sparingly; and he which soweth bountifully shall reap also bountifully.
In Job 4:8:
8 Even as I have seen, they that plow iniquity, and sow wickedness, reap the same.