What is the ruling on saying "Except for the Messenger of Allah, except for Muhammad," and does it contain a violation of Islamic law?

There is no Sharia transgression in the phrase "May my father and mother be sacrificed for you, O Messenger of Allah." Its meaning is that the Messenger is the greatest of all people in truth and status, so there should be no negligence regarding his rights, even if they neglect their own rights. Raising these slogans is considered a way of supporting the religion of Allah and defending the Prophet, peace be upon him.