Avodah Zarah 28 - Going to an Idol-Worshipping Doctor
Rabbi Yochanan suffered from a sickness called tzafdina, a tooth ailment. He went to a certain idolatrous noblewoman for treatment. She made him a remedy on Thursday and Friday, but on Saturday, he could not come, because of many students, and asked for a recipe. She said, "Swear that you will not reveal it to anyone!" He said, "To the God of Israel I will not reveal" (but to the people I will), then taught it in public. But he swore?!? - He explained the trick to her right away. Some say that she committed suicide, but some say that she converted, impressed with Rabbi Yochanan's selflessness.
Now, seeing that Rabbi Yochanan was ready to take the medicine on Saturday, it must have been a life-threatening disease, and if so, how was he allowed to go to an idolatrous doctor? - Rabbi Yochanan was a distinguished person whom the doctor would be afraid to harm.
Art: Doctor Viau in his Surgery by Edouard (Jean-Edouard) Vuillard
