I came to the Prophet ﷺ and heard him recite this verse, "So whoever does an atom's weight of good will see it, and whoever does an atom's weight of evil will see it" [Zalzalah 99:7–8]. I said, "By Allah, I do not care if I hear nothing else. This is enough for me, this is enough for me."
قدمت على النبي ﷺ فسمعته يقرأ هذه الآية: {فمن يعمل مثقال ذرة خيرا يره ومن يعمل مثقال ذرة شرا يره} فقلت: والله، لا أبالي أن لا أسمع غيرها، حسبي حسبي.
Imam Ahmad (20594), Nasai in Kubra (11630), Tabarani in Kabir (8/90), and Hakim (3/613) all narrated it through various chains from Jareer bin Hazim, who said, "I heard Hasan say, Sasah bin Muawiya narrated to us," and then he related it. Its chain of transmission is sahih.Haythami said in Majma (7/141), "Ahmad and Tabarani narrated it both as mursal and as connected, and the men of both versions are the men of sahih."In the versions of Ahmad and Nasai, it appears as "Sasah bin Muawiya, uncle of Farazdaq," which is an error. The correct reading is "uncle of Ahnaf."Sasah bin Muawiya is Ibn Hisn bin Ubadah Tamimi Saadi, the uncle of Ahnaf bin Qays. Askari and others mentioned him among the companions, and the leading scholars relied on this, recording him in their musnads, such as Imam Ahmad and Tabarani. Likewise, Ibn Hajar relied on this and mentioned him in the first section of Isabah.Some scholars denied his companion status, but the one who affirms takes precedence over the one who denies.