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In 1John 5, John is speaking of what he witnessed at the cross.
First the spirit departing from Yeshua so that he could die, then the water and blood pouring out of the wound in his side, and down through the crack onto the mercy seat on the Ark in Jeremiah’s grotto below.
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That’s one of the opinions. I don’t think it makes too much sense because that could have happened to anyone. As a courtroom-type witness? not to the observer.