20 Thou sittest and speakest against thy brother; against thy own mother’s son thou utterest slander.
Psalms 50:20 Cross References - Leeser
Leviticus 19:16
16 Thou shalt not go up and down as a talebearer among thy people; thou shalt not stand idly by the blood of thy neighbor: I am the Lord.
Psalms 31:18
18 (31:19) Let the lying lips be made dumb, which speak hard things against the righteous, with pride and contempt.
Proverbs 10:18
18 He that hideth hatred hath lips of falsehood; and he that spreadeth abroad an evil report, is a fool.