A protest made on the Day about people he knew
Aisha heard him describe himself waiting for them.
إِنِّي عَلَى الْحَوْضِ أَنْتَظِرُ مَنْ يَرِدُ عَلَىَّ مِنْكُمْ فَوَاللَّهِ لَيُقْتَطَعَنَّ دُونِي رِجَالٌ فَلأَقُولَنَّ أَىْ رَبِّ مِنِّي وَمِنْ أُمَّتِي . فَيَقُولُ إِنَّكَ لاَ تَدْرِي مَا عَمِلُوا بَعْدَكَ مَا زَالُوا يَرْجِعُونَ عَلَى أَعْقَابِهِمْ
I will say: my Lord, from me and from my nation. And it will be said: you do not know what they did after you.
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)