“One year al-Hassan ibn Ali left for Mecca on foot. On the journey his feet swelled and his servants said, 'If you would ride the swelling will go away.' He said, 'Nay, if we reach this place of rest you will a black person who has oil with him, buy from oil without trying to reduce the price.' The servant said, 'May my parents be your ransom, we have never been to a place of rest where anyone would sell such medicine.' The Imam (a.s.) 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. Al-Hassan (a.s.) said to his servant, 'There is the man. Take the oil from him and pay him.' The black man asked the servant, 'For whom do you want this oil?' He replied, 'I want it for al-Hassan ibn Ali (a.s.).' He said, 'Take me to him.' They came to al-Hassan (a.s.) and the man said, 'May my parents be your ransom! I did not know that you need this. If you would like to have it you have it free of charge. I am only one your servants. Just pray to Allah for me that i may be granted a healthy son who would love you, Ahl al-Bayt. When I left, my wife was about to give birth.' The Imam (a.s.) said, 'Go to your home. Allah has gifted you with a healthy son who is of our Shi‘a (followers).'"