---
title: "Question 78: What is forbidden in the ninth commandment? | Westminster Shorter Catechism"
description: "Westminster Shorter Catechism, question 78: What is forbidden in the ninth commandment? The ninth commandment forbiddeth whatsoever is prejudicial to truth, or injurious to our own or our neighbor’s good name.Scri"
canonical: "https://ctkrp.org/shorter-catechism/question-78-what-is-forbidden-in-the-ninth-commandment/"
source: "https://ctkrp.org/assets/rpcna-constitution-2026.pdf#page=168"
---

# Question 78: What is forbidden in the ninth commandment? | Westminster Shorter Catechism

The ninth commandment forbiddeth whatsoever is prejudicial to truth, or injurious to our own or our neighbor’s good name.

Scripture proofs: 1 Sam. 17:28; Lev. 19:16; Ps. 15:3.

Original source: [2026 RPCNA Constitution](https://ctkrp.org/assets/rpcna-constitution-2026.pdf#page=168)

## Related reading

- [What does “Reformed” mean?](https://ctkrp.org/learn/what-is-reformed/)
- [Westminster Confession of Faith · Chapter 19: Of the Law of God](https://ctkrp.org/confession/chapter-19-law-of-god/)
- [Westminster Shorter Catechism · Question 39: What is the duty which God requireth of man?](https://ctkrp.org/shorter-catechism/question-39-what-is-the-duty-which-god-requireth-of-man/)
- [Westminster Larger Catechism · Question 91: What is the duty which God requireth of man?](https://ctkrp.org/larger-catechism/question-91-what-is-the-duty-which-god-requireth-of-man/)
- [Question 77](https://ctkrp.org/shorter-catechism/question-77-what-is-required-in-the-ninth-commandment/)
- [Question 79](https://ctkrp.org/shorter-catechism/question-79-which-is-the-tenth-commandment/)

Canonical page: https://ctkrp.org/shorter-catechism/question-78-what-is-forbidden-in-the-ninth-commandment/