By way of background, read Proverbs 12:17-22:
Whoever speaks the truth gives honest evidence,
but a false witness speaks deceitfully.
18Rash words are like sword thrusts,
but the tongue of the wise brings healing.
19Truthful lips endure forever,
but a lying tongue lasts only a moment.
20Deceit is in the mind of those who plan evil,
but those who counsel peace have joy.
21No harm happens to the righteous,
but the wicked are filled with trouble.
22Lying lips are an abomination to the Lord,
but those who act faithfully are his delight.
Also read Proverbs 6:16-19:
There are six things that the Lord hates,
seven that are an abomination to him:
17haughty eyes, a lying tongue,
and hands that shed innocent blood,
18a heart that devises wicked plans,
feet that hurry to run to evil,
19a lying witness who testifies falsely,
and one who sows discord in a family.