Proverbs 25:9 KJV
Debate thy cause with thy neighbour himself; and discover not a secret to another:
Proverbs 25:9, King James Version
In context
8 Go not forth hastily to strive, lest thou know not what to do in the end thereof, when thy neighbour hath put thee to shame.
9 Debate thy cause with thy neighbour himself; and discover not a secret to another:
10 Lest he that heareth it put thee to shame, and thine infamy turn not away.