Proverbs 24:2

For their heart studieth destruction, and their lips talk of mischief.
— Proverbs 24:2, King James Version

In other translations

World English Bible (WEB)

For their hearts plot violence, And their lips talk about mischief.

American Standard Version (ASV)

For their heart studieth oppression, And their lips talk of mischief.

Young's Literal Translation (YLT)

For destruction doth their heart meditate, And perverseness do their lips speak.