St Nicodemus No Jokes or Laugh
Command 8 Do Not Bear False Witness

St Nicodemus: Can Christians Laugh and Joke?

St Nicodemus teaches us that the speech of Christians who laugh at ribald jokes “is corrupted, since they fill their speech with obscene, indecent, shameless, and meretricious words.” Likewise, regarding Christians who laugh at ribald jokes, “their thought is corrupted.” “Just as their words are crude and lewd, so also the thoughts and ideas in their souls are crude and lewd.” “Speech is a mirror, image, and imprint of the thoughts and inner disposition of the heart.” “He who utters obscene words churns up filth, mud and manure, which is spread first to himself, and then to those who hear it.” […]

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. […]