Volume 8, Book 76, Number 586:
Narrated Ibn Al-Musaiyab:
The companions of the Prophet said, “Some men from my companions will come to my Lake-Fount
and they will be driven away from it, and I will say, ‘O Lord, my companions!’ It will be said, ‘You
have no knowledge of what they innovated after you left: they turned apostate as renegades (reverted
from Islam).