When the Angel came to greet ‘Ali (as)

Huzaifah Yamani  said:
The Prophet, peace be upon him and his progeny, (once) said to me: "Did you see the person who presented himself to me?" 
I said: "Yes, O messenger of Allah." 
He said: "He was an angel who had never descended before this. He sought permission from Allah, Most High, to greet ‘Ali; he was granted permission and then greeted him. And he gave me glad news that al-Hasan and al-Husayn are the masters of the youths of Paradise, and Fatimah is the leading lady of all the women in Paradise."