(1) بَابُ مَا جَاءَ فِي قَوْلِ اللَّهِ تَعَالَى: {وَاتَّقُوا فِتْنَةً لاَ تُصِيبَنَّ الَّذِينَ ظَلَمُوا مِنْكُمْ خَاصَّةً}
Narrated Asma':
The Prophet (ﷺ) said, "I will be at my Lake-Fount (Kauthar) waiting for whoever will come to me. Then some people will be taken away from me whereupon I will say, 'My followers!' It will be said, 'You do not know they turned Apostates as renegades (deserted their religion).'" (Ibn Abi Mulaika said, "Allah, we seek refuge with You from turning on our heels from the (Islamic) religion and from being put to trial").
Reference: Sahih al-Bukhari 7048
In-book reference: Book 92, Hadith 1
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 88, Hadith 172