The Messenger of Allah ﷺ said, "The person with the greatest concerns is the believer, who worries about the affairs of both his worldly life and his afterlife."Abu Abdullah said, "This is a rare hadith. Ismail is the only one who narrated it."
حدثنا إسمعيل بن بهرام حدثنا الحسن بن محمد بن عثمان زوج بنت الشعبي حدثنا سفيان عن الأعمش عن يزيد الرقاشي
قال رسول الله ﷺ أعظم الناس هما المؤمن الذي يهم بأمر دنياه وآخرته قال أبو عبد الله هذا حديث غريب تفرد به إسمعيل
No references are available.
[Its chain of transmission is daif] It was narrated by Ibn Abu Dunya in al-Hamm wal-Huzn from the hadith of Ismail through this route, and see hadith no. 1080 for its defect, as it also contains other defects.