Chapter 40: Lord's Day 40
Section 109. Q. 109: Is it enough in this commandment that we do not steal? A. No. God tells us to take action against greed and useless spending and to share our goods with those in need. In addition, we are to work faithfully so that we are able to give to those who are in need.
Section 110. Q. 110: What is forbidden in the eighth commandment? A. God forbids not only outright theft and robbery, punishable by law. But in God's sight theft also includes cheating and swindling our neighbor by schemes made to appear legitimate, such as: inaccurate measurements of weight, size, or volume; fraudulent merchandising; counterfeit money; excessive interest; or any other means forbidden by God. In addition God forbids all greed and pointless squandering of his gifts.