“Pray as you have seen me praying” (Bukhari & Ahmad)
If a man came and performed a dance for you and sang a song in Chinese and told you to watch carefully and then do as you have seen me doing, would you then in your turn follow the exact movements of his dance and yet sing the song in your native language instead?
Anyways, there is a basic principle in Fiqh. When it comes to matters of ibadah, everything is haraam except for that which there is clear evidence from the Quran and Sunnah. And when it comes to all other matters, everything is halaal except for that which there is clear evidence from the Quran and Sunnah. So someone cant come and say, “we are allowed to pray Fajr salah standing on our heads, show me an ayah or hadith that forbid such prayer”. Rather you are NOT allowed to perform Fajr prayer standing on your head UNLESS you have a clear daleel for this act. Likewise, someone cant come and say, “bananas are haraam, show me an ayah or hadith that say that they are halaal”, rather we know that bananas are halaal, unless there is a clear daleel to prove otherwise
Moreover, there were many non-Arabs who embraced Islam at the time of the Prophet [pbuh] afterwards. Everyone did not speak Arabic obviously. Is there any record of anyone NOT performing their prayers in Arabic. If anyone ever did, if the Prophet ever approved of such an action, surely it would be clearly known
