:23 Jesus said to them, “Surely you will quote this proverb to me: ‘Physician, heal yourself!’ And you will tell me, ‘Do here in your hometown what we have heard that you did in Capernaum.’” - Gospel of Luke chapter 4:23
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The first textual reference to this proverb was citing Jesus in the Gospel of Luke chapter 4:23 in the context that Jesus expected to hear the proverb said to him in Nazareth, where "the people there would expect him to work miracles in his hometown as he had in other places".