Q. 87. What is forbidden in the tenth commandment?
A. The tenth commandment forbids all discontentment with our own estate, envying or grieving at the good of our neighbor, and all inordinate motions and affections to anything that is his.
Nor grumble, as some of them did and were destroyed by the Destroyer. 1 Corinthians 10:10
Do not grumble against one another, brothers, so that you may not be judged; behold, the Judge is standing at the door. James 5:9
Let us not become conceited, provoking one another, envying one another. Galatians 5:26
Put to death therefore what is earthly in you: sexual immorality, impurity, passion, evil desire, and covetousness, which is idolatry. Colossians 3:5