The Book of Virtues
Ṣaḥīḥ Muslim 5973
رَبِّ مِنِّي وَمِنْ أُمَّتِي . فَيَقُولُ إِنَّكَ لاَ تَدْرِي مَا عَمِلُوا بَعْدَكَ مَا زَالُوا يَرْجِعُونَ عَلَى أَعْقَابِهِمْ
rabbi minnī wamin ummatī . fayaqūlu innaka lā tadrī mā ʿamilūā baʿdaka mā zālūā yarjiʿūna ʿalā aʿqābihim
Transliteration generated from the Arabic vowel marks
The full narration
A'isha reported:I heard Allah's Messenger (ﷺ) say in the company of his Companions: I would be on the Cistern waiting for those who would be coming to me from amongst you. By Allah, some persons would be prevented from coming to me, and I would say: My Lord, they are my followers and people of my Umma. And He would say,: You don't know what they did after you; they had been constantly turning back on their heels (from their religion)
Source
Ṣaḥīḥ Muslim · 5973
- Agreed upon as authentic (al-Bukhārī / Muslim)