What proof do you have? Any?
The verse is not in most of the early scripts. Check for yourself.
It does not exist in the Peshitta or the Greek scripts of Aleph, A, B and the Vulgate.
The rumor about the change comes from the notes I have in the Aramaic to English. How true it is that the Emperor made the change I do not question for he was involved in formulating church doctrine to please the majority pagans.
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