“One year Hasan Ibne Ali left for Mecca on foot. On the journey his feet got swollen and his servants said, “If you would ride the swelling will go away.”
He said, “I will not do so up to the coming place for rest where you will meet a black person who has oil with him buy from oil without trying to reduce the price.”
The servant said, “May Allah take my soul and the souls of my parents in service for your cause, we have never come up to a place of rest where anyone would sell such medicine.”
Imam (a) said to him, “Yes, there are such people right in front of you before reaching the place for rest.”
They walked for a mile and they met the black person.
Hasan (a) said to his servant, “There is the man. Take the oil from him and pay him.”
The black man asked the servant, “For who do you want this oil?”
He replied, “I want it for Hasan Ibne Ali (a).”
He said, “Take me to him.”
They came to Imam Hasan (a) and the man said:
“May Allah take my soul and the souls of my parents in service for your cause. I did not know that you need this. If you would like to have it, you take it free. I am only one your servants. Just pray for to Allah to grant me a healthy son who would love you, Ahle Bayt. When I left, my wife was about to give birth.”
Imam (a) said, “Go to your place. Allah has gifted you with a healthy son, who is of our Shia (followers).”
Al-Kafi, Vol. 1, Pg. 463; Al-Kharaij, Vol. 1, Pg. 239.