Hadith 12: Leaving what does not concern the Muslim ترك ما لا يعني المسلم
Ali ibn Husayn reported: The Messenger of Allah, peace and blessings be upon him, said:
إِنَّ مِنْ حُسْنِ إِسْلَامِ الْمَرْءِ تَرْكَهُ مَا لَا يَعْنِيهِ
Verily, from the perfection of Islam is that a person leaves what does not concern him.
Source: Sunan al-Tirmidhī 2318, Grade: Sahih li ghayri