Proverbs 30:10 KJV

Accuse not a servant unto his master, lest he curse thee, and thou be found guilty.
Proverbs 30:10, King James Version

In context

9 Lest I be full, and deny thee, and say, Who is the Lord? or lest I be poor, and steal, and take the name of my God in vain.

10 Accuse not a servant unto his master, lest he curse thee, and thou be found guilty.

11 There is a generation that curseth their father, and doth not bless their mother.