The Sufficient (Vol 2) · Hadith 578 (#Ḥadīth #2)
Chapter 70 | Concern for the Affairs of the Muslims, Giving Them Good Advice and to Benefit Them
2ـ وَبِهَذَا الإسْنَادِ قَالَ قَالَ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وآلِه) أَنْسَكُ النَّاسِ نُسُكاً أَنْصَحُهُمْ جَيْباً وَأَسْلَمُهُمْ قَلْباً لِجَمِيعِ الْمُسْلِمِينَ.
2. It is reported through the same chain of narrators who has said the following: “The Messenger of Allah has said, ‘The most assiduous worshipper among the people is the one whose inner center is most clean and whose heart is most peaceful toward Muslims.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).