Psalm 50:19 in the World English Bible
“You give your mouth to evil. Your tongue frames deceit.
Context
18 When thou sawest a thief, then thou consentedst with him, and hast been partaker with adulterers.
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.