Sahih Muslim · Hadith 6136
The Book Pertaining to the Excellent Qualities of the Holy Prophet (may Peace be upon them) and His - كتاب الفضائل
وحدثني محمد بن حاتم، حدثنا عفان بن مسلم الصفار، حدثنا وهيب، قال سمعت عبد العزيز بن صهيب، يحدث قال حدثنا أنس بن مالك، أن النبي صلى الله عليه وسلم قال " ليردن على الحوض رجال ممن صاحبني حتى إذا رأيتهم ورفعوا إلى اختلجوا دوني فلأقولن أى رب أصيحابي أصيحابي . فليقالن لي إنك لا تدري ما أحدثوا بعدك " .
Anas b. Malik reported Allah's Apostle (may peace be upon him) as saying: Some persons from amongst my associates would turn to my Cistern; when I would see them and they would be presented to me, they would be detained in the way while coming to me. I would say: My Lord, they are my companions, they are my companions, and it would be said to me: You don't know what innovations they made after you.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).