"all of the illness which I placed in Egypt I will not place upon you": And what is the intent of "for I am the L–rd who heals you"? The Holy One Blessed be He said to Moses: Tell Israel that the words of Torah which I gave to you are healing for you, are life for you. As it is written (Mishlei 4:22) "for they are life to him who finds them", and (Ibid. 3:8) "It is healing to your navel and marrow to your bones."
all of the illness which I placed in Egypt I will not place
Mekhilta Tractate Vayassa 1:26