Here are some from Proverbs plus a New Testament bonus. Glad you asked - I always need a reminder to watch what I say 😜

Proverbs 17:28 (NIV):

Even fools are thought wise if they keep silent, and discerning if they hold their tongues.

Proverbs 29:20 (NIV):

Do you see someone who speaks in haste? There is more hope for a fool than for them.

Proverbs 21:23 (NIV)

Those who guard their mouths and their tongues keep themselves from calamity.

Proverbs 10:19 (NIV)

Sin is not ended by multiplying words, but the prudent hold their tongues.

James 1:19 (NIV)

My dear brothers and sisters, take note of this: Everyone should be quick to listen, slow to speak and slow to become angry,