Discourage gossip, and don't put people in the position of spying or reporting on each other.

制止流言蜚语，不要让人做卧底或者打小报告。

youdao

Let your virtues speak for themselves. Refuse to talk of another's vices. Discourage gossip. It is a waste of valuable time and can be extremely destructive.

让优点自己表现出来。拒绝谈论他人的缺陷。劝阻流言蜚语。那是宝贵时间的浪费，破坏性可能极强。

youdao