Musnad Ahmad 32:478

Abu al-Nadr narrated to us, al-Mubarak narrated to us, from Abd al-Aziz ibn Suhayb, from Anas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Two men from among those who accompanied me will certainly come to me at the Basin (al-Hawd). When I see them and they are raised up to me, they will be snatched away from before me."