رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 67
The Book of Miscellany
Watchfulness
الثامن: عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّه عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ : مَنْ حُسْنِ إسْلَامِ الْمَرْءِ تَرْكُهُ مَا لَا يَعْنِيهِ ((حَدِيثٌ حَسَنٌ رَوَاهُ التِّرْمِذِيُّ وغيره))
Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (ﷺ) said, "It is from the excellence of (a believer's) Islam that he should shun that which is of no concern to him". [At-Tirmidhi].
Riyad as-Salihin, 67