Psalm 50:19 KJV
Thou givest thy mouth to evil, and thy tongue frameth deceit.
Psalm 50:17–21 KJV Chapter Context
17
Seeing thou hatest instruction, and castest my words behind thee.
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.
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.