One day, Imam Hasan (as) was sitting in his place when he was confronted by a man who had come from Syria. As soon as the man set his eyes upon the Imam (as), he began to curse and revile him; but the Imam (as) remained silent till he had completed his outburst.
When he had stopped, the Imam (as) turned towards him, greeted him, smiled and then said: “Brother! You seem to be a stranger here and you have apparently made a mistake. If you want me to disregard your behaviour and forgive you, I shall do so; if you seek something from me, I shall grant it to you; if you want me to guide you, I shall do so; if you are hungry, I shall feed you; if you are in need of clothes, I shall provide them to you; if you are needy, I shall give you all that you need; if you have been expelled, I shall grant you shelter and if you have a desire, I shall fulfill it for you. If you can be my guest for the duration of your stay here, it would be to your benefit, since my house is large and contains all amenities.”
Hearing these words of Imam Hasan (as), the man burst into tears and said: “I bear witness that you are Allah’s Caliph upon the earth and Allah knows best where He places His message and caliphate. Before this meeting of ours, I regarded you and your father as my greatest enemies amongst the people, but now you are the most beloved of them all for me.” The man stayed with Imam Hasan (as) as his guest for the entire duration of his stay in Madinah and eventually became one of the sincere followers of the Ahlul Bayt.( Muntahal A’mal, Volume 1, Page 222 )