Psalm 50:20 in the King James Version
Thou sittest and speakest against thy brother; thou slanderest thine own mother’s son.
Context
19 “You give your mouth to evil. Your tongue frames deceit.
20 You sit and speak against your brother. You slander your own mother’s son.
21 You have done these things, and I kept silent. You thought that I was just like you. I will rebuke you, and accuse you in front of your eyes.