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.

Proofs

• 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. (Psalm 15; Proverbs 19:5; Proverbs 19:9; Proverbs 21:28; Matthew 7:1; Luke 6:37; Romans 1:28–32)
• Rather, I must avoid all lying and deceit as the devil’s own works, under penalty of God’s heavy wrath. (Leviticus 19:11–12; Proverbs 12:22; Proverbs 13:5; John 8:44; Revelation 21:8)
• In court and everywhere else, I must love the truth, (1 Corinthians 13:6; Ephesians 4:25)
• speak and confess it honestly, and do what I can to defend and promote my neighbour’s honour and reputation. (1 Peter 3:8–9; 1 Peter 4:8)