الكافي 1/4/123/9

9. Certain persons of our people have narrated from Muhammad ibn Ali who has said the following. “Zayd ibn Ali ibn al-Husayn ibn Zayd narrated to me as follows. “I became ill and a doctor came to see me at night. He prescribed a medicine for me to be taken at night for so and so many days. I could not find the medicine that night. The physician was still there that Nasr came in with a bottle that contained the medicine that the physician had prescribed for me and said, “Abu al-Hassan عليه السلام sends you the greeting of peace and has asked you to take this medicine for so and so many days.” I took the medicine and recovered from my illness.” Muhammad ibn Ali has said that Zayd ibn ail told me, “The critics would refuse to accept this hadith saying, “Wherefrom the extremist have brought this hadith?”