For the source text click/tap here: Bava Kamma 85
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The Gemara derives from the extra phrase of "Rapo Yerapei" (Shemos 21:19)
that a doctor is permitted to heal sick people.
Why would one have thought that a doctor is not permitted to heal a sick person, had the Torah not included the extra word "Yerapei"? The verse refers to a situation in which one person causes bodily damage to another, and the victim needs to pay a doctor to heal him. It is obvious from the verse, even without the extra word, that a person who is harmed does not have to passively accept the fate of being wounded by the other person, but that he may go to a doctor to be healed.
RASHI and TOSFOS seem to understand that the Gemara learns from the extra word that even when a person becomes sick or bruised without human intervention, but rather as a Divine decree, a doctor still is permitted to heal him. One might have thought that this is a matter of faith in Hash-m and that a person should trust that just as Hash-m brought the illness upon him, Hashem will take it away.
The verse teaches that it is not considered a lack of faith to turn to a doctor for healing.
We explore the notion of Medical Healing from traditional and modern perspectives.