From the Shorter Catechism

Q. 74. What is required in the eighth commandment?

A. The eighth commandment requireth the lawful procuring and furthering the wealth and outward estate of ourselves and others. Gen. 30:30; 1 Tim. 5:8; Lev. 25:35; Deut. 22:1-5; Ex. 23:4-5; Gen. 47:14, 20.