וְנָגַ֧ף יְהוָ֛ה אֶת־מִצְרַ֖יִם נָגֹ֣ף וְרָפ֑וֹא וְשָׁ֙בוּ֙ עַד־יְהוָ֔ה וְנֶעְתַּ֥ר לָהֶ֖ם וּרְפָאָֽם׃
And the LORD will smite Egypt, smiting and healing; and they shall return unto the LORD, and He will be entreated of them, and will heal them.
Read kabbalistic (mystical) interpretation of Isaiah 19:22: and classical mystical sources.