Ebionite Arabia and the development of the Arabic language

As for the development of Arabic, do the Ebionites have their own gospel(s)? Perhaps an Arabic gospel becomes the important Arabic literature instead of the Koran in OTL.
I think they have their own Gospels, although the details were quite patchy at best.
UPDATE:
Yup, the Ebionites have their own gospel/s, but I also sensed that Muhammad would probably write a so-called the Testament of Muhammand (or Gospel of Muhammad), which summarized the teachings and doctrines of Ebionitism, aside from translating the writings into Classical Arabic.
 
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