Exodus 15:26

If thou wilt diligently hearken to the voice of the Lord thy God, &c. He here states the substance of what he required of them. For as yet he did not load them with that grievous yoke of ceremonies, which he thought fit afterward to lay upon them, for the hardness of their hearts, or because they showed themselves incapable of a more liberal and ingenuous service. And to this the words of the Lord by Jeremiah seem to refer, Jeremiah 7:22, “I spake not to your fathers in the day I brought them out of the land of Egypt, concerning burnt-offerings, or sacrifices,” &c. I will put none of these diseases upon thee Either such preternatural plagues as God had inflicted on the Egyptians, or the diseases which were peculiar to Egypt, and most frequent in that country, such as the leprosy and other cutaneous diseases. This intimates that if they were disobedient, the plagues which they had seen inflicted on their enemies should be brought on them. The threatening is implied only, but the promise is expressed. I am the Lord that healeth thee That preserves thee in health, as well as heals thy diseases.