Prov.25.9

Debate thy cause with thy neighbour himself; and discover not a secret to another:

Prov.25.9

In the heat of an argument, don't betray confidences;

Prov.25.9

If you argue your case with a neighbor, do not betray another man's confidence,

Prov.25.9

So discuss the matter with them privately. Don't tell anyone else,