-- Mi 2:1-5
You shall not covet . . . anything that is your neighbor's. . . . You shall not desire your neighbor's house, his field, or his manservant, or his maidservant, or his ox, or his ass, or anything that is your neighbor's.
The tenth commandment unfolds and completes the ninth, which is concerned with concupiscence of the flesh. It forbids coveting the goods of another, as the root of theft, robbery, and fraud, which the seventh commandment forbids. "Lust of the eyes" leads to the violence and injustice forbidden by the fifth commandment. Avarice, like fornication, originates in the idolatry prohibited by the first three prescriptions of the Law. The tenth commandment concerns the intentions of the heart; with the ninth, it summarizes all the precepts of the Law.
-- CCC 2534
More on the Martyrs of Compiegne here.