Musnad Ahmad 31:294

Waki’ narrated to us, from al-A’mash, from Abu Salih, from Abu Sa’id al-Khudri, who said: The Messenger of Allah (ﷺ) said: "Allah, the Mighty and Majestic, will say on the Day of Resurrection: 'O Adam, arise and send forth the contingent of the Fire.' He will say: 'At Your service and at Your command, and all good is in Your hands, O Lord. And what is the contingent of the Fire?' He will say: 'From every thousand, nine hundred and ninety-nine.' He said: 'At that time, the newborn will turn gray, {and every pregnant woman will drop her load, and you will see the people as drunk, while they are not drunk, but the punishment of Allah is severe} [al-Hajj: 2].' He said: 'They will say: "Then which one of us is that one?"' He said: The Messenger of Allah (ﷺ) said: 'Nine hundred and ninety-nine are from Gog and Magog, and from you is one.' He said: The people said: 'Allahu Akbar.' The Messenger of Allah (ﷺ) said: 'By Allah, I truly hope that you will be a quarter of the people of Paradise. By Allah, I truly hope that you will be a third of the people of Paradise. By Allah, I truly hope that you will be half of the people of Paradise.' He said: The people said: 'Allahu Akbar.' He said: The Messenger of Allah (ﷺ) said: 'You, on that day, among the people, are only like a white hair on a black bull—or like a black hair on a white bull.'"