What does Exodus 15:26 mean?

He said, 'If you really listen to me, the Lord your God, and do what’s right, if you pay attention to my commands and keep my rules, I won’t bring on you any of the sickness I brought on the Egyptians. I am the Lord who heals you.' Exodus 15:26 - Modern Text Bible

(God promises protection and health if they follow him. He reveals himself as a healer, not just a rescuer.)