What is required in the ninth commandment?

I must not give false testimony against anyone, twist no one’s words, not gossip or slander, nor condemn or join in condemning anyone rashly and unheard. Rather, I must avoid all lying and deceit as the devil’s own works, under penalty of God’s heavy wrath. In court and everywhere else, I must love the truth, speak and confess it honestly, and do what I can to defend and promote my neighbour’s honour and reputation.

Scripture proofs King James Version

Ps. 15
Prov. 19:5, 9 A false witness shall not be unpunished, and he that speaketh lies shall not escape. ... A false witness shall not be unpunished, and he that speaketh lies shall perish.
Prov 21:28 A false witness shall perish: but the man that heareth speaketh constantly.
Matt. 7:1 Judge not, that ye be not judged.
Luke 6:37 Judge not, and ye shall not be judged: condemn not, and ye shall not be condemned: forgive, and ye shall be forgiven:
Rom. 1:28-32 And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient; Being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity; whisperers, Backbiters, haters of God, despiteful, proud, boasters, inventors of evil things, disobedient to parents, Without understanding, covenantbreakers, without natural affection, implacable, unmerciful: Who knowing the judgment of God, that they which commit such things are worthy of death, not only do the same, but have pleasure in them that do them.
Lev. 19:11, 12 Ye shall not steal, neither deal falsely, neither lie one to another. And ye shall not swear by my name falsely, neither shalt thou profane the name of thy God: I am the LORD.
Prov. 12:22 Lying lips are abomination to the LORD: but they that deal truly are his delight.
Prov 13:5 A righteous man hateth lying: but a wicked man is loathsome, and cometh to shame.
John 8:44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
Rev. 21:8 But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.
I Cor. 13:6 Rejoiceth not in iniquity, but rejoiceth in the truth;
Eph. 4:25 Wherefore putting away lying, speak every man truth with his neighbour: for we are members one of another.
I Pet. 3:8, 9 Finally, be ye all of one mind, having compassion one of another, love as brethren, be pitiful, be courteous: Not rendering evil for evil, or railing for railing: but contrariwise blessing; knowing that ye are thereunto called, that ye should inherit a blessing.
I Pet 4:8 And above all things have fervent charity among yourselves: for charity shall cover the multitude of sins.

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Edition & Source Public domain

Source: The Heidelberg Catechism
Translation: English translation as published by apuritansmind.com; Scripture proofs: King James Version
Published: First published 1563
Original URL: apuritansmind.com/creeds-and-confessions/the-heidelberg-catechism-by-zacharias-ursinus/
Copyright: Public domain.
License: Public domain
Attribution: Public domain. Text transcribed from apuritansmind.com, which reformed.org's historic-documents index links to. Compared automatically with the PDF at heidelberg-catechism.com, which is the same translation family: 217 of 258 questions and answers matched. Of the 41 that did not, I checked 18 by hand: Q12, Q18, Q27, Q56 and Q61 differ in wording, and the others were page-layout noise in the PDF; the remaining 23 were not checked by hand. Not yet proofread against a printed edition. Part divisions are the standard ones (Q1–2 introduction; Q3–11 misery; Q12–85 deliverance; Q86–129 thankfulness). The question 23 creed text had verse-number markers removed. Scripture proof texts are the King James Version, from the public-domain Project Gutenberg edition, added with tools/add_kjv.py. A few references could not be matched to verses (whole-chapter references such as ‘Genesis 1 throughout’, and typing slips in the source) and are shown without text.

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Cite as The Heidelberg Catechism. First published 1563. https://www.apuritansmind.com/creeds-and-confessions/the-heidelberg-catechism-by-zacharias-ursinus/