Proverbs 17:28
Even an ignorant fool, when he keeps silent, is considered wise;
When he closes his lips, he is considered understanding.

Proverbs 10:8
The wise of heart will receive commandments,
But an ignorant fool of loose lips will be ruined.

Ephesians 4:29
Let no unwholesome word proceed from your mouth, but only such a word as is good for building up what is needed, so that it will give grace to those who hear.

Proverbs 18:21
Death and life are in the power of the tongue,
And those who love it will eat its fruit.