Lord's Day 43
Q 112. What is required in the ninth commandment?
A. I must not give false testimony against anyone, twist no one's words, not gossip or slander, nor condem or join in condeming 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.