What is the ruling on the one who says: “I ask Allah by the right of there being no god but Allah to heal you”?

Question:
He says: Honorable Shaykh, may Allah grant you success, regarding seeking nearness to Allah through the testimony that there is no god but Allah. The person says, “I ask Allah by the right of there being no god but Allah to heal you.” Is this permissible?

Answer:
This is a right, so leave it. Say, “I ask You by the fact that I testify that there is no god but You.” Say it that way, seeking nearness to Allah through tawhid (the oneness of Allah), just as Yunus (peace be upon him) said: He sought nearness to Him through tawhid and his admission of his mistake, so Allah answered his supplication. So you do not say “by the right of there being no god but Allah”; rather, say, “I ask You by the fact that I testify that there is no god but You,” or “by the fact that I testify that there is no god but Allah.”