Exodus 15:26 He said, "If you listen carefully to the Lord your God and do what is right in His eyes, if you pay attention to His commands and keep all His decrees, I will not bring on you any of the diseases I brought on the Egyptians, for I am the Lord, Who heals you."
(The Lord has just performed a miraculous provision for His people by turning bitter water into drinkable water. And He used their need to teach them a life lesson, that their highest calling is to obey the Lord. As He does in our lives still today, He uses every situation to teach us more about Him and His ways, more about His saving power, more about the path that He knows is best for us. As He told Israel then, He tells us now that if we obey Him and His decrees, if we walk in His ways instead of ours, He will protect us, and we will avoid the consequences of the choices we make that spring out of our own willful flesh.
He declares that if we heed His laws that are meant for our benefit
that He will be able to keep us and protect us from the evils that beset ungodly people, and that He will heal us both body and soul,
both the disease of the body as well as the disease of the soul.)