وَعَنْ أَبِي هُرَيْرَةَ رضى الله عنه
قَالَ: قَالَ رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ -«مِنْ حُسْنِ إِسْلَامِ اَلْمَرْءِ، تَرْكُهُ مَا لَا يَعْنِيهِ»
“A sign of man’s good observance of Islam (his piety) is to keep away from that which does not concern him.” Related by At-Tirmidhi who graded it as Hadith Hasan.