Psalms 55:21

55:21 His words are as smooth as butter,

but he harbors animosity in his heart.

His words seem softer than oil,

but they are really like sharp swords.

Psalms 59:7

59:7 Look, they hurl insults at me

and openly threaten to kill me,

for they say,

“Who hears?”

Psalms 64:3

64:3 They sharpen their tongues like a sword;

they aim their arrow, a slanderous charge,

Proverbs 12:18

12:18 Speaking recklessly is like the thrusts of a sword,

but the words of the wise bring healing.

Proverbs 18:21

18:21 Death and life are in the power of the tongue,

and those who love its use will eat its fruit.

James 3:6-8

3:6 And the tongue is a fire! The tongue represents the world of wrongdoing among the parts of our bodies. It pollutes the entire body and sets fire to the course of human existence – and is set on fire by hell.

3:7 For every kind of animal, bird, reptile, and sea creature is subdued and has been subdued by humankind. 3:8 But no human being can subdue the tongue; it is a restless evil, full of deadly poison.