The Prophet (s.a.w.a.) looked at Ali b. Abi Talib (a.s.) and said: He is the best from the first to the last of all of the inhabitants of the heavens and the earths. He is the master of the truthful ones. He is the beauty of the successors. He is the Imam of the pious and he is the leader of the believers.
On the Day of Judgement, Ali will ride on a camel from the camels of Paradise, and the light of the camel will light the entire plain on which the judgement process will take place.
Because he will be wearing a crown made of sapphires and gems, the angels will say that Ali is a high-ranked angel and the prophets will say that he is a prophet.
Then the caller will call from inside the Throne, This is the most truthful; this is the heir of Allahs love (the Prophet (s.a.w.a.), this is Ali b. Abi Talib.
Ali will stand on top of Hell. Whoever he does not love will enter Hell, and whoever he loves will be saved.
Then Ali will come to the gates of Paradise and his friends and Shia will enter from any door they choose, without judgement.
Ghaayah al-Maraam p 46 Behaar al-Anwaar v 26 p 316