Musnad Ahmad 830:121

'Affan narrated to us, Hammad bin Salamah narrated to us, 'Ali bin Zayd informed us, from al-Hasan, from Abu Bakrah, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Men from among those who accompanied me and saw me will certainly come to me at the Basin (al-Hawd). Until, when they are raised up to me and I see them, they will be snatched away from before me. I will surely say: 'O Lord, my companions, my companions!' It will be said: 'Indeed, you do not know what they innovated after you.'"