Command 8 Do Not Bear False Witness

Do Not Slander: Church Fathers and Preachers, and Catholic Catechism, CCC 2464

The Church Fathers focus on our love for our neighbor when contemplating this commandment.  St Gregory Palamas in our English translation renders the commandment as, “You shall not accuse anyone falsely.”  We are warned that if we accuse anyone falsely, we may “become like the devil, who falsely accused God to Eve and was cursed by God.  Rather, we should conceal our neighbor’s offense, unless by so doing others may be injured; and in this way we will imitate not Ham, but Shem and Japeth, and so like them receive the blessing.”
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Command 8 Do Not Bear False Witness

St John Climacus in Ladder of Divine Ascent on Slander, Talkativeness, and Lying, Steps 10, 11 and 12

Many people think that one of the Ten Commandments prohibits us from lying, but that is a shallow understanding of the commandment.  Actually, the Ten Commandments urges us not to bear false witness against our neighbor.  Not only are we forbidden to slander our neighbor, but we are also urged to guard his reputation.  We slander our neighbor even when we tell the truth in a hurtful manner. […]