Anas ibn Malik reported: The Prophet, peace and blessings be upon him, said, “Some of my companions will come to me at the fountain in the Hereafter, until I recognize them. They will be taken away from me, then I will say: My companions! It will be said: You do not know what they innovated after you.”
Source: Ṣaḥīḥ al-Bukhārī 6211, Ṣaḥīḥ Muslim 2304
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
عَنْ أَنَسٍ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ لَيَرِدَنَّ عَلَىَّ نَاسٌ مِنْ أَصْحَابِي الْحَوْضَ حَتَّى عَرَفْتُهُمُ اخْتُلِجُوا دُونِي فَأَقُولُ أَصْحَابِي فَيَقُولُ لاَ تَدْرِي مَا أَحْدَثُوا بَعْدَكَ
صحيح البخاري كتاب الرقاق باب في الحوض 6211
2304 صحيح مسلم كتاب الفضائل باب إثبات حوض نبينا صلى الله عليه وسلم وصفاته