Proverbs 20:19

19 A gossip betrays a confidence; so avoid anyone who talks too much.

Read Proverbs 20:19 Using Other Translations

He that goeth about as a talebearer revealeth secrets: therefore meddle not with him that flattereth with his lips.
Whoever goes about slandering reveals secrets; therefore do not associate with a simple babbler.
A gossip goes around telling secrets, so don’t hang around with chatterers.