The four riders on the day of Qiyamah

He said: Abu Ali al-Hasan b. Ali b. Fadhl al-Razi reported to me from Abul Hasan Ali b. Ahmad b. Bishr al-Askari, who reported from Abu Ishaq Muhammad b. Haroon b. Isa al-Hashimi, who reported from Abu Ishaq Ibrahim b. Mahdi al-Ibili, who reported from Ishaq b. Sulaiman al-Hashimi, who reported from his father, who reported from Haroon al-Rashid, who reported from his father al-Mahdi, who reported from al-
Mansur Abu Ja'far Abdullah b. Muhammad b. Ali, from his father, from his grandfather Ali b. Abdillah b. al-Abbas, from Abdillah b. Abbas b. Abdul Muttalib, who said:

I heard the Prophet, peace be upon him and his progeny say: "Four of us will be the riders on the Day of Resurrection and none other." So someone asked: "My father and mother be your ransom, who are the riders?"

He said: "I will be riding al-Buraq, and my brother Swaleh will be mounting the god-sent she-camel which was hamstrung by his people, and my daughter Fatimah will be on my bright she-camel, and Ali b. Abi Talib, who will ride one of the she-camels of Paradise, whose bridle will be of fresh pearls, whose eyes will of ruby, whose stomach will of green aquamarine; upon the camel will be cupola of translucent pearls, so that its exterior will be visible from within, and her interior will be seen from outside. Its exterior will be from the mercy of Allah, and its interior will be from His grace.

She will be fast as she advances, and also as she retracts. He will be ahead of me. There will be a crown of light on his head, a crown which will give light to all assembled. It will have seventy corners, each shining like a brilliant star in the heaven; and in his hands will be the praised standard, and he will set forth announcing:

'There is no god but Allah, and Muhammad is His messenger.' And he will pass among the angels, they will say: 'He must be from the sent Prophets.' And as he will pass by the Prophets, they will say: 'He must be an angel nearest to Allah.' And then it will be announced from inside the Throne:

'O people! He is neither an angel nearest to Allah, nor a sent Prophet, nor a carrier of the Throne. He is Ali b. Abi Talib.' Then his Shiahs will follow, and it will be announced: 'Who are you?' They will say: 'We are the partisans of Ali.' The answer will come: 'O partisans of Ali, you are secure; enter the Paradise and be with those who you loved."

(Ref: Al-Amali Shaikh Mufeed The Thirty  Second Assembly Hadees No.3)