The Book of Asceticism · Hadith 22 (#Ḥadīth #19)
Chapter 1 | On silence Except when Speaking what is Good, Abandonment of what does not concern one, and Slander
النضر بن سويد عن القاسم بن سليمان عن أبي عبد الله عليه السلام قال: سمعت أبي يقول: من حسن اسلام المرء تركه ما لا يعنيه.
19.Al-Naḍr ibn Suwayd narrated from al-Qāsim ibn Sulaymān, from Abū ʿAbdillāh who said, “I heard my father say, ‘It is from the beauty of a person’s [devotion to] Islam to eschew that which does not concern him.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).