Psalm 64:8 in the King James Version
So they shall make their own tongue to fall upon themselves: all that see them shall flee away.
Context
7 But God will shoot at them. They will be suddenly struck down with an arrow.
8 Their own tongues shall ruin them. All who see them will shake their heads.
9 All mankind shall be afraid. They shall declare the work of God, and shall wisely ponder what he has done.