Psalm 50:20 in the World English Bible
You sit and speak against your brother. You slander your own mother’s son.
Context
19 Thou givest thy mouth to evil, and thy tongue frameth deceit.
20 Thou sittest and speakest against thy brother; thou slanderest thine own mother’s son.
21 These things hast thou done, and I kept silence; thou thoughtest that I was altogether such an one as thyself: but I will reprove thee, and set them in order before thine eyes.