WSC Q.81: What is forbidden in the tenth commandment?
The tenth commandment forbiddeth all discontentment with our own estate, (1 Kings 21:4, Esther 5:13, 1 Cor. 10:10) envying or grieving at the good of our neighbour, (Gal. 5:26, James 3:14,16) and all inordinate motions and affections to any thing that is his. (Rom. 7:7–8, Rom. 13:9, Deut. 5:21)
WLC Q.148: What are the sins forbidden in the tenth commandment?
The sins forbidden in the tenth commandment are, discontentment with our own estate; (1 Kings 21:4, Esth. 5:13, 1 Cor. 10:10) envying (Gal. 5:26, James 3:14,16) and grieving at the good of our neighbour, (Ps. 112:9–10, Neh. 2:10) together with all inordinate motions and affections to any thing that is his. (Rom. 7:7–8, Rom. 13:9, Col. 3:5, Deut. 5:21)