Does the adhan of a mu'adhdhin who puts the word "Messenger of Allah" in the accusative case suffice?

Question:
He says: Honorable Shaykh, may Allah grant you success, does the adhan of a mu'adhdhin who puts the word "Messenger of Allah" in the accusative case suffice, or is he ordered to repeat it?

Answer:
This is a grammatical error called a lahn. They say there is a linguistic rule in it, a rule that one can put the subject and the predicate in the accusative case, but this is one of the peculiarities of the language, and it is not to be brought into worship or the adhan. One says "Muhammad is the Messenger of Allah"; this is a sentence with a subject and a predicate. When you introduce "that" (an) to it, you say "I bear witness that Muhammad is the Messenger of Allah." You open the first word, and the second remains in the nominative case. "Muhammad" and "that Muhammad is the Messenger of Allah"—this known, apparent Arabic phrasing, it appears that it is not valid now, because the benefit that completes the speech did not come, as the Bedouin who passed by said: the benefit that completes the speech did not come.