The main teaching of Hadith twelve of An-Nwawai's collections is

The twelfth Hadith of the An-Nawawi's collection is centered around the concept of non-interference. This Hadith teaches the importance of focusing on matters that are directly relevant and beneficial to oneself, while avoiding involvement in matters that are not of personal concern or within one's responsibility.

In simpler terms, the teaching encourages people to mind their own business and refrain from unnecessary interference in the affairs of others unless such involvement is warranted or necessary. It underscores the value of being considerate about what one chooses to engage with, promoting personal well-being and social harmony by minimizing unnecessary conflicts and misunderstandings that may arise from undue interference.

By emphasizing non-interference, this Hadith aims to instill a sense of self-discipline in individuals, whereby they focus on improving their own lives and actions rather than being distracted by or meddling in matters that do not pertain to them directly.