Proverbs 30:10-12

Amplified Bible

¹⁰ 
Do not slander or malign a servant before his master [stay out of another’s personal life],
Or he will curse you [for your interference], and you will be found guilty.

¹¹ 
There is a generation (class of people) that curses its father
And does not bless its mother.
¹² 
There is a generation (class of people) that is pure in its own eyes,
Yet is not washed from its filthiness.