“To heal he shall heal,” from here is derived that authorization is granted [by G-d] for the doctor to heal. (Mishpatim 21:19. Bava Metzia 85a).
There was once a Jew who fell critically ill, doctors were unable to find a cure for his illness. His visits to professors and specialists also failed, they were all at a loss in healing him.
He traveled to the Rebbe Maharash in Lubavitch seeking his blessings to cure his incurable illness. The Rebbe gave him his blessings and referred him to a doctor in Vitebsk. The Chosid went to this doctor, but he wondered to himself: He had already tried the greatest specialists, who had failed to help him, how can this „common‟ doctor possibly help him?!
However this doctor found a solution, gave him a remedy and the Jew became well. With great joy he returned to the Rebbe Maharash to share with him the good news of his recovery, and thank him for the brochahs he had given him. During yechidus, he expressed in astonishment that the greatest medical experts were helpless in curing him, yet this obscure doctor found a cure right away...
The Rebbe Maharash pointed to his place and said to him: “From ‘here’ [from the Rebbe] authorization is given for a doctor to heal...!”
(Sicha of Yud Shevat 5728)
