Muhammad b. ‘Amir narrated from Muhammad b. ‘Alim al-Thaqafi from ‘Ammar b. ‘Isa al-Kilabi from ‘Abd Allah b. Sinan on the authority of Abu ‘Abd Allah, peace be upon him, that he [Ibn Sinan] said: A man from the Shi’a complained to him [Abu ‘Abd Allah] of a cyst (sil’a) that had appeared on him. Abu ‘Abd Allah, peace be upon him, told him: ‘Fast for three days, then bathe on the fourth day at noon and go out into the open plain to your Lord. Take with you a clean, patched, and ragged garment. Read four rak'as of prayer and recite in it whatever is easy of the Qur'an, and be submissive in your endeavour. When you finish your prayer, cast off your clothes and put on the ragged garment, and put your right cheek on the earth.
‘Then say in supplication, humbly, and submissively: “O Single, O One, O Noble, O Compassionate, O Omnipotent, O Near, O Responder, O Most Merciful of the merciful, bless
Muhammad and the family of Muhammad, and rcmove what is in me of illness, and clothe me with well-being, sufficient and healing, in this world and the next. Bestow on me all the blessings and remove what is in me for it has troubled and distressed me.”
Then Abu ‘Abd Allah, peace be upon him, said to him: ‘Know that it will not benefit you until there is no conflict against it in your heart, and you know that it will benefit you.’ He [Ibn Sinan] said: The man did as Ja'far al-Sadiq, peace be upon him, instructed him, and he was cured of it.