Our actions, good or bad, have consequences. We "reap" the consequences of the deeds we have done.
7 Do not be deceived: God cannot be mocked. A man reaps what he sows.
Galatians 6:7
Psalm 126:5
5 Those who sow in tears will reap with songs of joy.
http://www.biblegateway.com/passage/?search=Psalm+126:5&version=NIV
Proverbs 11:18
The wicked man earns deceptive wages, but he who sows righteousness reaps a sure reward.
http://www.biblegateway.com/passage/?search=Proverbs+11:18&version=NIV
Proverbs 22:8
He who sows wickedness reaps trouble, and the rod of his fury will be destroyed.
http://www.biblegateway.com/passage/?search=Proverbs+22:8&version=NIV